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 hr 20 min

1 hr 11 min

1 hr 12 min

1 hr 30 min

New speed = 6/7 of usual speed. New time = 7/6 of usual time => [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.

Walking 6/7 of his usual speed, a man is the 25 Minutes too late. Find the usual time.

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