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By walking at 3/4 of his usual speed , a man reaches his office 20 minutes later than usual . this usual time is ?
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- 30 minutes
- 60 minutes
- 75 minutes
- 1 hour 30 minutes
Correct Option: B
At 3/4 of the usual speed, the time taken is 4/3 of the usual time
∴ 4/3 of usual time - usual time = 20 min
⇒ 4x/3 - x = 20
⇒ x/3 = 20
∴ x = 60 min.