Discussion :: Clock

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?
Answer : Option B
Explanation :
Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.
The watch gains[2+4\(\frac { 4 } { 5 } \)]min.or \(\frac { 34 } { 5 }\)min. in 170 hrs
Now,\(\frac { 34 } { 5 }\) min are gained in 170 hrs.
2 min. are gained in[170x\(\frac { 5} { 34 }\)x2]hrs=50hrs
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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