A takes 2hr more than B to walk D km. If A double his speed than he can make it in 1hr less than B. How much time does B require for walking D km ?

A. 1 hr

B. 1.5 hr

C. 2.5 hr

D. 4 hr

Solution(By Examveda Team)

Let time take by B to walk D km = T

Time taken by A to walk D km = (T +2).

Since, ST = D. When distance is constant, Speed is inversely propotional to time taken, means if speed become double, time taken would become half.

So,

In second case time taken by A = (T +2)/2.

Now, this time A takes 1 hr less than B.

(T +2)/2 = T-1

T +2 = 2T - 2

T = 4 hours.