Intermediate Mathematics

Time Zones

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Time Zones
Time Zone - As the Earth rotates, daylight in one area of the world becomes darkness in another area. To standardize international time, 24 time zones were created around the world, each differing from the preceding zone by one hour.
Time Zones
Each time zone is one hour earlier than the time zone to its east and one hour later than the time zone to its west.
This drawing shows the relationship of time in a few of the major cities around the world.
Time Zones
The British Prime Minister arrives in Tokyo at 3:00 a.m. A news reporter immediately calls his London office. What time is it in London?
To answer questions like this, find the clocks for the cities mentioned.
The clocks show that when it is 2 a.m. in Tokyo, it is 5 p.m. in London. The Tokyo time is 3 a.m., one hour later than the 2 a.m. shown on the clock. So, one hour must be added to the London time. It is 6 p.m.
(5 p.m. + 1 hr.) in London when the news reporter calls his office.
Time Zones

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You live in Vancouver. You want to call your brother in Tokyo. If it is 7:00 a.m. in Vancouver, what time is it in Tokyo?
12 noon
12 midnight
9:00 a.m.
2:00 a.m.
None of these
Question 1 of 10
It is 2 hours earlier than the times shown on the clocks. 12 noon is 14 hours earlier than 2 a.m. Try again.
The Vancouver time of 7 a.m. is 2 hours earlier than the 9 a.m. shown on the clock. The Tokyo time is 2 a.m. − 2 hours, or 12 midnight.
When it is 9 a.m. in Vancouver, it is 2 a.m. in Tokyo. You are calling from Vancouver at 7 a.m. Try again.
It is 2 a.m. in Tokyo when it is 9 a.m. in Vancouver. You are calling from Vancouver at 7 a.m. Try again.
One of these is the time in Tokyo when it is 7:00 a.m. in Vancouver. Try again.
The clocks show that when it is 9 a.m. in Vancouver, it is 2 a.m. in Tokyo.
Time Zones

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You are flying from Sydney to Moscow. You leave Sydney at 10:00 a.m. What time is it in Moscow?
4:00 a.m.
2:00 a.m.
8:00 p.m.
2:00 p.m.
None of these
Question 2 of 10
When it is 4 a.m. in Sydney, it is 8 p.m. in Moscow. You are leaving Sydney at 10 a.m. Try again.
The Sydney time of 10 a.m. is 6 hours later than the 4 a.m. shown on the clock. The Moscow time is 8 p.m. + 6 hours, or 2 a.m.
It is 8 p.m. in Moscow when it is 4 a.m. in Sydney. You are leaving Sydney at 10 a.m. Try again.
It is 6 hours later than the times shown on the clocks. 2 p.m. is 6 hours earlier than 8 p.m. Moscow time. Try again.
One of these is the time in Moscow when you leave Sydney at 10 a.m. Try again.
The clocks show that when it is 4 a.m. in Sydney, it is 8 p.m. in Moscow.
Time Zones

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A live news broadcast is televised in Buenos Aires at 5:00 p.m. What time could be the same newscast be seen in Rome?
9:00 p.m.
3:00 p.m.
6:00 p.m.
5:00 p.m.
None of these
Question 3 of 10
The Buenos Aires time of 5 p.m. is 3 hours later than the 2 p.m. shown on the clock. The Rome time is 6 p.m. + 3 hours, or 9 p.m.
It is 3 hours later than the times shown on the clocks. 3 p.m. is 3 hours earlier than the 6 p.m. Rome time. Try again.
It is 6 p.m. in Rome when it is 2 p.m. in Buenos Aires. The newscast is televised in Buenos Aires at 5 p.m. Try again.
When it is 2 p.m. in Buenos Aires, it is 6 p.m. in Rome. It is 5 p.m. in Buenos Aires when the newscast is televised. Try again.
One of these is the time the Buenos Aires newscast could be seen in Rome. Try again.
The clocks show that when it is 2 p.m. in Buenos Aires, it is 6 p.m. in Rome.
Time Zones
Four time zones cover the continental U.S. and much of Canada. These are the Pacific, Mountain, Central, and Eastern time zones. Moving from west to east, each time zone is one hour later than the previous one.
When it is 10 a.m. in San Diego (Pacific time), it is 11 a.m. in Denver (Mountain time), noon in Winnipeg (Central time), and 1 p.m. in Miami (Eastern time).
Time Zones
To change time from west to east, add 1 hour for each time zone. To change time from east to west, subtract 1 hour for each time zone.
It is 5 p.m. in Oregon (Pacific time), and you want to know the time in Maine (Eastern time). Maine is 3 time zones to the east of Oregon, so it is 3 hours later (5 p.m. + 3 hours). The time in Maine is 8 p.m.
Time Zones

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You are flying from Dallas to Seattle to visit your grandmother. It is 4:30 p.m. when you leave Dallas. What time is it in Seattle?
6:30 p.m.
4:30 p.m.
3:30 p.m.
2:30 p.m.
None of these
Question 4 of 10
The time 6:30 p.m. is 2 hours later than 4:30 p.m. Seattle is 2 time zones west of Dallas, so it is 2 hours earlier in Seattle. Try again.
It is 4:30 p.m. in Dallas, but Seattle is 2 time zones to the west. Try again.
The time 3:30 p.m. is 1 hour earlier than 4:30 p.m. Seattle is 2 time zones west of Dallas, so it is 2 hours earlier in Seattle. Try again.
The time in Seattle is 2 hours earlier than the time in Dallas. It is 4:30 p.m. − 2 hours, or 2:30 p.m., in Seattle when you leave Dallas.
One of these is the time in Seattle when it is 4:30 p.m. in Dallas. Try again.
Seattle is 2 times zones west of Dallas.
Time Zones

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Your sister has a baby at 5:00 a.m. in New York. You want to call your mother in Vancouver. What time is it in Vancouver?
2:00 a.m.
8:00 a.m.
4:00 a.m.
6:00 a.m.
None of these
Question 5 of 10
Vancouver is 3 time zones west of New York. It will be 5 a.m. − 3 hours, or 2 a.m., when you call your mother.
The time 8:00 a.m. is 3 hours later than 5:00 a.m. Vancouver is 3 time zones west of New York, so it is 3 hours earlier in Vancouver. Try again.
The time 4:00 a.m. is 1 hour earlier than 5:00 a.m. Vancouver is 3 time zones west of New York, so it is 3 hours earlier in Vancouver. Try again.
The time 6:00 a.m. is 1 hour later than 5:00 a.m. Vancouver is 3 time zones west of New York, so it is 3 hours earlier in Vancouver. Try again.
One of these is the time in Vancouver when it is 5:00 a.m. in New York. Try again.
Vancouver is 3 time zones west of New York.
Time Zones

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You call your cousin in Birmingham to tell her to watch a show. The show begins at 8:00 p.m. where you live in San Jose. What time is it in Birmingham?
8:00 p.m.
6:00 p.m.
10:00 p.m.
9:00 p.m.
None of these
Question 6 of 10
It is 8:00 p.m. in San Jose. Birmingham is 2 time zones east of San Jose, so it is 2 hours later in Birmingham. Try again.
The time 6:00 p.m. is 2 hours earlier than 8:00 p.m. Birmingham is 2 time zones east of San Jose, so it is 2 hours later in Birmingham. Try again.
The time in Birmingham is 2 hours later than the time in San Jose. It is 8 p.m. + 2 hours, or 10 p.m., in Birmingham when the show begins.
The time 9:00 p.m. is 1 hour later than 8:00 p.m. Birmingham is 2 time zones east of San Jose, so it is 2 hours later in Birmingham. Try again.
One of these is the time in Birmingham when it is 8 p.m. in San Jose. Try again.
Birmingham is 2 time zones east of San Jose.
Time Zones
Sometimes it is necessary to account for elapsed time as well as a change in time zones. To do this, you can find the time in the new time zone and then add the elapsed time.
It is 9 a.m. in Houston (Central time). You want to know what time it will be in Calgary (Mountain time) an hour later. Since Calgary is one time zone to the west of Houston, it will be 8 a.m. in Calgary (9 a.m. − 1 hour) when it is 9 a.m. in Houston. One hour later, it will be 9 a.m. in Calgary ( 8 a.m. + 1 hour).
Time Zones

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Paul calls his brother from Los Angeles at 6 p.m. His brother lives in Montreal. If the call lasts for 20 minutes, what time does Paul's brother hang up the phone?
8:20 p.m.
9:20 p.m.
9:00 p.m.
6:20 p.m.
None of these
Question 7 of 10
Montreal is 3 time zones east of Los Angeles. Try again.
When it is 6 p.m. in Los Angeles, it is 9 p.m. in Montreal (6 p.m. + 3 hours). 9:00 p.m. + 20 minutes = 9:20 p.m. Paul's brother hangs up at 9:20 p.m.
When it is 6 p.m. in Los Angeles, it is 9 p.m. in Montreal. But the call lasted for 20 minutes. Try again.
It is 6:20 p.m. in Los Angeles when Paul hangs up. Montreal is 3 time zones east. What time will it be when his brother hangs up? Try again.
One of these is the time in Montreal when Paul's brother hangs up the phone. Try again.
Montreal is 3 time zones east of Los Angeles.
Time Zones

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You are flying to Cheyenne to visit your grandmother. When you leave the airport in Cleveland, it is 2:30 p.m. If your flight is 4 hours long, what time will it be in Cheyenne when you arrive?
6:30 p.m.
2:30 p.m.
12:30 p.m.
4:30 p.m.
None of these
Question 8 of 10
It is 6:30 p.m. in Cleveland when you land in Cheyenne. Cheyenne is 2 time zones west of Cleveland. Try again.
It is 2:30 p.m. in Cleveland when you leave the airport. Cheyenne is 2 time zones west of Cleveland, and your flight is 4 hours long. Try again.
It is 12:30 p.m. in Cheyenne when it is 2:30 p.m. in Cleveland. But your flight is 4 hours long. Try again.
When it is 2:30 p.m. in Cleveland, it is 12:30 p.m. in Cheyenne (2:30 − 2 hours). 12:30 + 4 hours = 4:30 p.m. It is 4:30 p.m. when you land in Cheyenne.
One of these is the time in Cheyenne when you arrive. Try again.
Cheyenne is 2 time zones west of Cleveland.
Time Zones

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Joe works in Boise. At 6:15 a.m., he faxes a contract to Maive in Boston. The fax takes 15 minutes. What time is it in Boston when the fax is complete?
6:30 a.m.
6:15 a.m.
8:30 a.m.
8:15 a.m.
None of these
Question 9 of 10
It is 6:15 a.m. in Boise when Joe begins faxing. Boston is 2 time zones east of Boise, and the fax takes 15 minutes. Try again.
It is 6:15 a.m. in Boise when the fax starts. Boston is 2 time zones east of Boise, and the fax takes 15 minutes. Try again.
When it is 6:15 a.m. in Boise, it is 8:15 a.m. in Boston (6:15 a.m. + 2 hours). 8:15 a.m. + 15 minutes = 8:30 a.m. It is 8:30 a.m. in Boston when the fax is complete.
When the fax begins at 6:15 a.m. in Boise, it is 8:15 a.m. in Boston. The fax takes 15 minutes to complete. Try again.
One of these is the time in Boston when the fax is complete. Try again.
Boston is 2 time zones east of Boise.
Time Zones

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You take a train from Pittsburgh to Des Moines. If you leave at 7:30 a.m. and the trip takes 5 hours and 30 minutes, what time do you arrive in Des Moines?
12 noon
11:00 a.m.
6:30 a.m.
1:00 p.m.
None of these
Question 10 of 10
When it is 7:30 a.m. in Pittsburgh, it is 6:30 a.m. in Des Moines (7:30 a.m. − 1 hour). 6:30 a.m. + 5 hours 30 minutes = 12 noon. It is 12 noon when you arrive in Des Moines.
When it is 7:30 a.m. in Pittsburgh, it is 6:30 a.m. in Des Moines. What time is it in Des Moines 5 hours and 30 minutes later? Try again.
You leave Pittsburgh at 7:30 a.m. When it is 7:30 a.m. in Pittsburgh, it is 6:30 a.m. in Des Moines. The trip takes 5 hours and 30 minutes. Try again.
When it is 7:30 a.m. in Pittsburgh, it is 6:30 a.m. in Des Moines. What time is it in Des Moines 5 hours and 30 minutes later? Try again.
One of these is the time you arrive in Des Moines. Try again.
Des Moines is one time zone west of Pittsburgh.
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