Question

A man moves at a speed of $5\text{kmph}$ for $20\text{min}$ and goes back the same distance at a speed of $25\text{kmph}$. How much time does it take to go back? (in minutes)

• A. 4

Answer 1

The correct option is A 4
Distance travelled by the man = Speed $\times$ Time = $5\text{kmph}\times 20\text{min}$

Given that the man goes back the same distance. Let '$\text{t}$' be the time taken by the man. Then,

$5\text{kmph}\times 20\text{min}=25\text{kmph}\times \text{t}$

Therefore, $\text{t}=\frac{5\times 20}{25}=\frac{20}{5}=4\text{min}$