Aspire Faculty ID #16576 · Topic: NIMCET 2008 · Just now
NIMCET 2008

A watch which gains 10 seconds in 5 minutes was set correct at 9 a.m. When the watch indicated 20 minutes past 7 o’clock the same evening, the true time is:

Solution

The watch gains 10 seconds in 300 seconds. So it gains 1 second in 30 seconds. Time shown = 10 hours 20 minutes = 620 minutes. Actual time = 620 − (620 ÷ 30) = 600 minutes = 10 hours. So true time = 7 p.m.

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