By walking at3of his usual speed, 4a man reaches his office 20 minutes later than his usual time. The usual time taken by him to reach his office is

By walking at3of his usual speed, 4a man reaches his office 20 minutes

1.	By walking at3of his usual speed, 4a man reaches his office 20 minutes later than his usual time. The usual time taken by him to reach his office is
A.	75 minutes
B.	60 minutes
C.	40 minutes
D.	30 minutes
Answer» C. 40 minutes

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By walking at3of his usual speed, 4a man reaches his office 20 minutes later than his usual time. The usual time taken by him to reach his office is

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