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By walking at 3/4 of his usual speed, a man reaches his office 20 minute later than usual. this usual time is ?
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- 30 minute
- 60 minute
- 75 minute
- 1 hour 30 minute
Correct Option: B
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
