Walking at the rate of 5kmph a man cover certain distance in 5hr. Running at a speed of 15 kmph the man will cover the same distance in.  Choose the correct choice from the following:
A) 12 min  B) 36 min  C) 40 min  D) 48 min  E) 60 min

Rationale: distance = speed * time 5 * 5 = 25 km new speed = 15 kmph therefore time = 25 / 15 = 5 / 3 = 36 min answer : b
Answer: B