When it is 4:00 a.m. in London, it is 11:00 a.m. in Hanoi. If you leave Hanoi at 7:45 a.m. on Friday and fly to London over the course of 9 hours and 45 minutes, what time will it be in London when you land?a.12:30 a.m. Saturdayb.5:30 a.m. Fridayc.10:30 a.m. Fridayd.8:30 a.m. Friday

Hanoi is 7 hours ahead of London because 11:00 a.m. in Hanoi corresponds to 4:00 a.m. in London. Adding the 9 hours and 45 minutes of flight time to 7:45 a.m. Friday gives 5:30 p.m. Friday in Hanoi. Subtract 7 hours to convert to London time: 10:30 a.m. Friday, choice c.

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