A wrist watch was set accurately at 9 a.m. It then started to lose 1 second every 10 minutes. What time was indicated on the watch, when the exact time is 7 p.m. on the same day?

6:59 p.m.

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6:58 p.m.

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6:57 p.m.

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6:56 p.m.

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Solution

The correct option is A 6:59 p.m.
The watch loses 1 second every 10 minutes or 6 seconds every hour.
Time between 9 a.m. and 7 p.m. is 10 hours. The watch will lose = 10*6 = 60 seconds
So, when the actual time is 7, the time shown on watch will be 6:59 p.m.

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A wrist watch was set accurately at 9 a.m. It then started to lose 1 second every 10 minutes. What time was indicated on the watch, when the exact time is 7 p.m. on the same day?

The correct option is A 6:59 p.m.The watch loses 1 second every 10 minutes or 6 seconds every hour. Time between 9 a.m. and 7 p.m. is 10 hours. The watch will lose = 10*6 = 60 seconds So, when the actual time is 7, the time shown on watch will be 6:59 p.m.

The correct option is A 6:59 p.m.
The watch loses 1 second every 10 minutes or 6 seconds every hour.
Time between 9 a.m. and 7 p.m. is 10 hours. The watch will lose = 10*6 = 60 seconds
So, when the actual time is 7, the time shown on watch will be 6:59 p.m.