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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?

Correct Answer: 60 minutes

Explanation:

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.


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