By walking at 3/4 of his usual speed, a man reaches his office 20 minute later than usual. this usual time is?

30 minute
60 minute
75 minute
1 hour 30 minute

Correct Answer: 60 minute

Explanation:

At a speed of 3/4 of the usual speed, the time taken is 4/3 of the usual time
= (4/3 of usual time ) – (usual time ) = 20min.
⇒ 4x/3 -x = 20
⇒ x/3 =20
⇒ x=60 min

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