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:

** Option:**

**A.**1 hour

**B.**1 hour 30 minutes

**C.**1 hour 5 minutes

**D.**1 hour 12 minutes

**Answer: E . 1 hour 12 minutes**

** Justification:**

New speed = (6/7)of usual speed.

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.