# Moderate Time, Speed & Distance Solved QuestionAptitude Discussion

 Q. By walking at (dfrac{3}{4}^{th}) of his usual speed, a man reaches office 20 minutes later than usual. What is his usual time?
 ✖ A. 30 min ✔ B. 60 min ✖ C. 70 min ✖ D. 50 min

Solution:
Option(B) is correct

$\dfrac{3}{4}$ of a man's usual speed means, he takes $\dfrac{4}{3}$ of his usual time to cover the same distance, i.e. he takes

$=\dfrac{4}{3}-1$

$=\dfrac{1}{3}$ time extra.

$\dfrac{1}{3}$ time is 20 minutes (given)

Usual time = $20\times 3$= 60 minutes