[1 hr 12 min] Walking 6/7th of his usual speed, a man is 12 minutes too late. What is the usual time taken by him

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Walking 6/7th of his usual speed, a man is 12 minutes too late. What is the usual time taken by him to cover that distance?

1 hr 42 min

1 hr

2 hr

1 hr 12 min

Explanation:

New speed = 6/7 of usual speed

Speed and time are inversely proportional.

Hence new time = 7/6 of usual time

Hence, 7/6 of usual time - usual time = 12 minutes

=> 1/6 of usual time = 12 minutes

=> usual time = 12 x 6 = 72 minutes = 1 hour 12 minutes

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