Answers

2014-11-13T21:41:56+05:30
C takes 72 mins 
B runs thrice as fast.⇒b takes 72/3 mins=24 mins
A runs twice as fast as B⇒A takes 24/2=12 mins.

So the answer to the question is 4-12 mins
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2014-11-13T21:47:05+05:30
Given = A runs twice as fast as B
B runs thrice as fast.
C takes 72 mins 

Now A.T.Q

B = 72 / 3 =  24

and A = 24/2 = 12 minutes

Hence the option 4 - 12 minutes is correct . 



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