Multiple choice

The usual speed of a man is X. By walking at a speed 4/5th of X, the man reaches his office 10 minutes late. What is the usual time taken to reach the office if he walks with speed X?

  1. 40 minutes

  2. 30 minutes

  3. 20 minutes

  4. 10 minutes

  5. 50 minutes

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let Y be the distance. Usual time is Y/X = Z
When speed is 4/5 of X, then time = Y/(4/5X) = 5/4Z Also, 5/4 Z = Z + 10 minutes So, Z = 10 x 4 = 40 minutes