Things measured differently can't be worked on together: change them to the same unit or the same clock, then add, subtract or compare.
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Convert to the Same Kind: Time Zones
Methods in this video
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- 1
Two clocks? Put them on one
When to use it: The question says two places are some hours apart (hours ahead, hours behind, time zone) and asks the time or date in the other place, or adds a flight and asks the local time on arrival.
- An ahead clock runs in front: add to go there, subtract to come back.
- Break big jumps up: 14 = 12 + 2, 20 = 24 − 4. Passing midnight changes the date.
- With a third city in between, one ahead and one behind, add the two gaps.
- With a flight, put everything on one clock, then add the hours.
Practise exam-style questions with these methods
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