Posted by **Miep** on Saturday, March 3, 2012 at 3:38pm.

Robert has two watches, one which loses 6 seconds every 24 hours and one which gains 1 second

per hour. He sets both of them to the correct time at 6 : 00 p.m. How many hours will pass

before the positive diﬀerence between the time shown on both watches is 4 hours?

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