A man walking at three-fourths of his usual speed reached his office 4 minutes late. How much time (in minutes) does he usually take to reach his office?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e.12.
Let usual time = x minutes
New speed = of usual
Time increases by × x
Extra time = − x =
⇒ = 4
⇒ x = 12 minutes