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A watch gains 7 seconds in every 4 minutes. If the watch was set right on 9:30 AM, what time will it show at 9:30 PM on the same day?

A watch gains 7 seconds in every 4 minutes. If the watch was set right on 9:30 AM, what time will it show at 9:30 PM on the same day? Correct Answer 9:51 PM

The watch gains 7 seconds in every 4 minutes,

So, the watch would gain = 60/4 × 7 = 105 seconds in an hour

Time passed between 9:30 AM and 9:30 PM on the same day = 12 hours

⇒ The watch would gain = 12 × 105 = 1260 seconds = 21 minutes in 12 hours

Hence, when the correct time is 9:30 PM, the watch will show 9:51 PM

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