Question 1
In a 100 meters race, A beat B by 10 meter or 2 second. What is the speed of A?
5 Km/h
10 Km/h
15 Km/h
20 Km/h
Question 1 Explanation: 
When A completes 100m, B is at 90m which is 10m behind.Now A beats B by 2 secs.
This means B takes 2 more seconds to complete the race
As B is 10m behind when A completes the race, so B takes 2 secs to complete 10m
Speed of B = 5m/s
Total time of B = 100/5 = 20 secs
Time of A = 20 - 2 = 18 seconds
Speed of A = 100/18 = 5.555
There is 1 question to complete.

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