If Aman travels with 12.5% less speed of his usual speed, then he will reach 9 minutes late. What is the usual time taken by him?

63 minutes 

When distance is same,

ratio of time ∝ $\frac{1}{speed}$

12.5% = $\frac{1}{8}$

                 Original  :    New

Speed             8       :     7

Time               7       :     8 

        the difference = R 

We are given that Aman reaches 9 minutes late due to decrease in speed,

Thus, R = 9 minutes 

Usual time taken by Aman = 7 x 9 = 63 minutes