Question

 In a race of 200 m, A beats B by 45m or 9 seconds. Find time taken by A to complete the race.
1. 31 sec
2. 30 sec
3. 32 sec
4. 35 sec

Answer 1

Correct Answer - Option 1 : 31 sec

Given:

In a race of 200 m, A beats B by 45m or 9 seconds.

Concept used:

Time and Distance

Calculation:

A beats B by 45 m means in constant time t,

A runs 200 m while B runs 155m

Speed of B = (45/9) = 5 m/sec

B covers 155m in same time A covers 200 m

Time taken by B = (155/5) = 31 sec

A takes 31 sec.