Review the key concepts, formulae, and examples before starting your quiz.
šConcepts
Understanding Time Zones: The world is divided into different zones where the local time is different based on the position of the sun.
GMT/UTC: Greenwich Mean Time (GMT) or Universal Coordinated Time (UTC) is the starting point (0) for all time zones.
East vs. West: Locations to the East are ahead in time (+), while locations to the West are behind in time (-).
24-Hour Clock: Using 24-hour notation (e.g., 14:00 instead of 2:00 PM) makes calculating durations easier and avoids AM/PM confusion.
Calculating Duration: To find how long a journey takes across time zones, you must convert both the start time and arrival time to the same time zone first.
šFormulae
š”Examples
Problem 1:
London is at GMT+0 and Dubai is at GMT+4. If a plane leaves London at 09:00 and the flight takes 7 hours, what is the local time in Dubai when it lands?
Solution:
20:00 (or 8:00 PM)
Explanation:
First, find the arrival time in London time: 09:00 + 7 hours = 16:00. Then, convert London time to Dubai time by adding the 4-hour difference: 16:00 + 4 hours = 20:00.
Problem 2:
New York is GMT-5. If it is 10:00 AM in London (GMT+0), what time is it in New York?
Solution:
05:00 AM
Explanation:
Because New York is GMT-5, it is 5 hours behind London. Subtract 5 hours from 10:00 AM: 10 - 5 = 5. So, it is 05:00 AM.
Problem 3:
A flight leaves Paris (GMT+1) at 14:00 and arrives in Tokyo (GMT+9) at 08:00 the next day. How long was the flight?
Solution:
10 hours
Explanation:
First, convert the Tokyo arrival time to Paris time. Tokyo is 8 hours ahead of Paris (9 - 1 = 8). If it is 08:00 in Tokyo, subtract 8 hours to get Paris time, which is 00:00 (midnight). Now calculate the duration from 14:00 to 00:00. From 14:00 to 24:00 is 10 hours.