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Q. Rohit has a watch that gains 5 seconds in 3 minutes. It was set right at 9 a.m. in the morning.
In the afternoon of the same day, when the watch indicated 4 o'clock, how much time will the watch have gained?
Explanation by: Vinay Kumar
Time from 9 a.m. to 4 p.m. = 7 hrs The clock gains 5 secs in 3 min In 60 min, it will gain, (60 x 5) / 3 = 100 sec i.e. the clock gains 100 seconds in one hour In 7 hours, it will gain 700 sec. 700/60 mins = (11)2/3 mins
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