A and b take part in a 100m race
Asked by admin @ in Math viewed by 298 People
A and b take part in 100 m race. a runs at 5 kmph. a gives ba start of 8m and still beats him by 8 seconds. the speed of b is:
Answered by admin @
1km=1000metres
1hour=60minutes=60*60=3600seconds
speed of A is 5000metres per 60minutes(3600seconds)
A runs 5000 metres in 3600seconds
therefore A ran 100 metres in 3600/5000*100=72seconds
As A gave 8 metre headstart to B, therefore B actually covered 92 metres .
A ran 100 metres in 72seconds which was 8 seconds faster than B
Therefore B ran 92 metres in (72+8)=80seconds
In 80seconds B covers 92 metres
Therefore in 3600seconds(1 hour) B covers 4140metres
The speed of B is 4.14 kmph
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