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Aptitude - Clock - Discussion

@ : Home > Aptitude > Clock > General Questions - Discussion
4. 

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].
59 7 min. past 3
12
[B].
4 p.m.
[C].
58 7 min. past 3
11
[D].
2 3 min. past 4
11

Answer: Option B

Explanation:

Time from 7 a.m. to 4.15 p.m. = 9 hrs 15 min. = 37 hrs.
4

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

37 hrs of this clock = 1 hrs of the correct clock.
720 20

37 hrs of this clock = 1 x 720 x 37 hrs of the correct clock.
4 20 37 4

      = 9 hrs of the correct clock.

The correct time is 9 hrs after 7 a.m. i.e., 4 p.m.


Jaslin said: (Mon, Jul 12, 2010 05:40:27 PM)    
 
how we got 37/720

Khalid said: (Mon, Aug 2, 2010 06:08:21 AM)    
 
for 9 hrs the clock gains 15 min.. then what about the remaining 15 min in the quarter past 4...??? cant understand..???

Bala said: (Fri, Aug 6, 2010 09:49:26 AM)    
 
Hai Jaslin,

To convert mins and secs into hrs we do:

(3/60)+(5/(60*60)) = 185/3600 = 37/720.

I think u might be clear of this.

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