Question

A watch gains 5 seconds in 3 minutes and was set right at 8am .what time will it show at 10pm on the same day?

Answer 1

Watch gains 5 seconds in 3 minutes or 5 seconds in every 180 seconds.

Time passed in correct clock = 180 seconds

Time passed in faulty clock = 185 seconds.

Given: Time passed in faulty clock = 9 hours and 15 minutes = 9*60*60 + 15*60 = 33300 seconds

Time elapsed in the correct clock = 180/185*33300 = 32400 seconds = 9 hours.

Hence the time in correct clock = 7 + 9 hours = 4 PM