Clock - Arithmetic Aptitude Questions and Answers

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Discussion :: Clock

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:

59 $\frac {7 } { 12 }$ min. past 3

4 p.m.

58 $\frac {7 } { 11 }$ min. past 3

2 $\frac {3 } { 11 }$ min. past 3

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Answer : Option B

Explanation :

Time from 7 a.m. to 4.15 p.m. = 9 hrs 15 min. = $\frac { 37 } {4 }$ hrs.

3 min. 5 sec. of this clock = 3 min. of the correct clock.

$\frac { 37 } {720 }$ hrs of this clock = $\frac { 1 } { 20 }$ hrs of the correct clock

$\frac { 37 } {4 }$ hrs of this clock=[ $\frac { 1 } { 20 }$ x $\frac { 720 } {37}$ x $\frac { 37 } {4 }$ ]hrs of the correct clock