1.  In 100 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:
A. 20 m
B. 25 m
C. 22.5 m
D. 9 m

Answer: Option A

Explanation:

Distance covered by B in 9 sec.

   =100x 9m= 20 m.
45


A beats B by 20 metres.