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

By walking at 3/4 of his usual speed, a man reaches his office 20 minu

1.	By walking at 3/4 of his usual speed, a man reaches his office 20 minute later than usual. this usual time is ?
A.	30 minute
B.	60 minute
C.	75 minute
D.	1 hour 30 minute
Answer» C. 75 minute

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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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