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A watch which gains uniformly is 2 minutes low at noon on monday and is 4 min.48 sec fast at 2 p.m on the following monday. when was it correct ?

A. 2 p.m on Tuesday

B. 2 p.m on Wednesday

C. 3 p.m on Thursday

D. 1 p.m on Friday

View Answer

Correct choice: B

Explanation:

Time from 12 p.m on monday to 2 p.m on the following monday = 7 days 2 hours = 170 hours Therefore, The watch gains (2+4x4/5) min. or 34/5 min. in 170 hrs. Now, 34/5 min. are gained in 170 hrs. Therefore, 2 min are gained in (170×5/34×2) hrs = 50 hrs Therefore, Watch is correct 2 days 2 hrs. after 12 p.m on monday i.e it will be correct at 2 p.m on wednesday.

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