The ratio between the rates of travelling of A and B is 2 3 and therefore A takes 10 minutes more th...........

Quantitative Aptitude ( CCS) Time & distance

The ratio between the rates of travelling of A and B is 2:3 and therefore A takes 10 minutes more than the time taken by B to reach a destination. If A had walked at double the speed, he would have covered the distance in

30 min

25 min

20 min

15 min

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Explanation:

Time taken by B = x minutes.
Time taken by A= (x + 10) minutes
∴ 2/3 = x/(x + 10)
= 2x + 20 = 3x
x = 20 minutes
∴ Time taken by A = 30 minutes
So, Time taken by A when he doubles his speed
= 30/2 = 15 minutes