Question:Walking `6/7 th of his usual speed, a man is 12 minutes too late. The usual time taken by him to cover that distance is : 

A 1 hour 
B 1 hour 12 min 
C 1 hour 15 min 
D 1 hour 20 min 

+ Answer
B 

+ Explanation
New speed` = 6/7` of the usual speed.

New time taken` = 7/6` of the usual time

`(7/6 of usual time)` - (usual time) = 12 min.

`:. 1/6` of usual time = 12 min. or usual time = 72 min.

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Irin Moni

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