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A takes 2 hours more than B to walk d km. If A doubles his speed, then he can make it in 1 hour less than B. How much time does B require for walking d km.?

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answer is A.

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Detailed Solution

Let us assume that the time taken by B to walk d km be x.
Distance to be travelled

Time taken by B to walk d km

Time taken by A to walk d km

Speed of A

…………………………..(i)
Distance to be travelled

Time taken by B to walk d km

Time taken by A to walk d km

Speed of A

.............................(ii)
So, comparing equation (i) and equation (ii), we get

Now, after cross-multiplying, we get
Question Image

Hence, the time taken by B to walk d km is 4 hours.
So, option 1 is correct.

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