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Q. My watch, which gains uniformly, is 2 min and show at noon on Sunday, and is 4 min 48 seconds fast at 2PM on the following Sunday when was it correct?
Explanation:
At noon on Sunday watch gains 2 Minutes. And at 2PM on following Sunday it is 4 Minutes 48 Seconds fast. So, it gains 6 Minutes 48 Seconds i.e. 2 Minutes + 4 Minutes 48 Seconds (total 408 Seconds) in 170 Hours (Hours from Sunday Noon (12PM) to following Sunday 2PM) Therefore, watch gains 120 Seconds (2 Minutes) in 170*120/408 = 50 Hours 50 Hours = 2 Days 2 Hours Thus, Watch was correct after 2 days 2 hours from Sunday noon that is Tuesday 2PM.
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