Question:A watch which gains uniformly's is 5 min. slow at 8 o'clock in the morning on Sunday and it is 5 min. 48 sec. fast at 8 p.m. on following Sunday. When was it correct ?
Answer Time from 8 a.m. on Sunday to 8 p.m. on following Sunday = 7 days 12 hours = 180 hours. :. The watch gains `(5 + 5 4/5)` min or `54/5` min. in 180 hrs. Now` 54/5` min. are gained in 180 hrs. :. 5 min. are gained in `(180 xx 5/54 xx 5)` hrs. = 83 hrs 20 min. = 3 days 11 hrs 20 min. :. watch is correct 3 days 11 hrs 20 min. past 7 p.m.on Wednesday. :. It will be correct at 20 min.past 7 p.m. on Wednesday.
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A watch which gains uniformly's is 5 min. slow at 8 o'clock in the morning on Sunday and it is 5 min. 48 sec. fast at 8 p.m. on following Sunday. When was it correct ?