A watch gains 5 minutes in one hour and was set right at 8 AM. What time will it show at 8PM on the same day?

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Solution

A correct clock would have completed $12$ hours by $8$ pm. But the faster clock actually covers 5 min. extra in one hour. So, it will cover $12 \times 5 = 60$ minutes extra.
Therefore, when the correct clock would show $8$ pm, the faster clock will show $60$ minutes extra i.e. $9$ pm.

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A watch gains 5 minutes in one hour and was set right at 8 AM. What time will it show at 8PM on the same day?

A correct clock would have completed 12 hours by 8 pm. But the faster clock actually covers 5 min. extra in one hour. So, it will cover 12×5=60 minutes extra.Therefore, when the correct clock would show 8 pm, the faster clock will show 60 minutes extra i.e. 9 pm.

A correct clock would have completed $12$ hours by $8$ pm. But the faster clock actually covers 5 min. extra in one hour. So, it will cover $12 \times 5 = 60$ minutes extra.
Therefore, when the correct clock would show $8$ pm, the faster clock will show $60$ minutes extra i.e. $9$ pm.