Question

in a 100 meter race, A runs at 8km per hour. if A gives B a start of 4 meter and still beats him by 15 seconds, find the speed of B in meter/second?​

Answer 1

A's speed = (8*(5/18)= 20/9 m/sec

time taken by A to cover 100m = 100*(9/20) = 45 sec

so time taken by B to cover 96m =(45+15) =60sec

so B's speed is ((96/60)*(18/5)) kmph = 5.76 kmph

time taken by A to complete 100m = (100*60*60/8*1000)=45sec

A beats B by 15 sec which means B completes 100m in 60 sec.

therefore speed of B is= 96/60= 1.6m/sec.

Answer 2

Answer:

B is 3.46 meter/second