- The total time elapsed from 6 a.m. on Saturday to 12 noon on Monday is 54 hours (Saturday 6 am to Sunday 6 am = 24 hrs; Sunday 6 am to Monday 6 am = 24 hrs; Monday 6 am to Monday 12 noon = 6 hrs. Total = 24+24+6 = 54 hours). - The total time lost by the watch is 54 hours 20 seconds/hour = 1080 seconds. - Converting seconds to minutes: 1080 seconds / 60 seconds/minute = 18 minutes. - The watch is slow, so it will show 18 minutes less than the actual time (12 noon). - 12 noon - 18 minutes = 11:42.
A watch runs 20 seconds slow per hour. The watch was set right at 6 a.m. on Saturday. What time will the watch show at 12 noon on Monday ?
Asked in MPSC CS Prelims 2012 · Topic: Measurement/Unit (Physical Quantities (Fundamental and Derived))
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