Two watches are started at the same time. One runs two minutes per hour slow, and the other one minute per hour fast. How long must the watches run for the fast watch to be exactly one hour ahead of the slow watch?
Answer:
20 hours.........At the end of the first hour, the slow watch will have gone 58 minutes, while the fast watch will have gone 61 minutes. So every hour the fast watch gains 3 minutes on the slow one.
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