Walking 6 / 7 th of his usual speed, a man is 12 minutes too late. what is the usual time taken by him to cover that distance?
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Walking 6/7th of his usual speed, a man is 12 minutes too late. The usual time taken by him to cover that distance is:
1. 2 hour
2. 1 hr 12 min.
3. 1 hr 15 min.
4. 45 min
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New time = (7/6) of usual time.
Therefore (7/6 of usual time)- (usual time) = (1/5) hr.
=> (1/6 of usual time)= (1/5) hr
=> usual time = (6/5) hr
= 1 hr 12 min.