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Q.
A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o'clock, the true time is:
A.
4pm
B.
5pm
C.
6pm
D.
7pm
View Answer
Correct choice: A
Explanation:
Time from 7 am to 4.15 pm = 9 hrs 15 min = 37/4 hrs 3 min. 5 sec. of this clock = 3 min. of the correct clock. Now 3min.5sec. is37/720 hrs of this clock = 3 min.is1/20 hrs of the correct clock 37/4 hrs of clock = (1/20×720/37×37/4) hrs of the correct clock. = 9 hrs of the correct clock. The correct time is 9 hrs after 7 am. i.e., 4 pm.
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