Riddle: When it is 7 AM in New York, it is noon in London. A plane leaves London at 12 PM (noon) London time and arrives in New York at 11 AM New York time the same day. A second plane leaves New York at 12 PM (noon) New York time for London. What time in London is it when the second plane arrives? *Assume both planes fly for the same number of hours.* (Credited to MOEMS)
Answer: Strategy: Convert all the times to London time. From the first sentence, London time (LT) is 5 hours ahead of New York time (NYT). The first plane departs at 12 noon LT and arrives at 11 AM NYT, which is 4 PM LT, so the travel time is 4 hours. The second plane leaves New York at 12 noon NYT, which is 5 PM LT. The travel time is 4 hours, So it is 9 pm in London when the second plane arrives.
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