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Q. Two clocks are set right at 10 a.m. One gains 20 seconds and the other loses 40 seconds in 24 hours. What will be the true time when the first clock indicates 4 p.m. on the following day?
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Is the answer 3:59:35 pm ?

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for clock 1: gain per hour =20/24=5/6

for clock 2 : loss per hour = 40/24=10/6

so for six hours difference=10/6 *6 + 5/6 * 6=15 seconds

so when clock 1 is at 4 pm clock 2 will be at 3:59:45

 

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