Question

If a race of 200 metre, runs at speed of 10m/minute and B runs at a speed of 8m/sec. By what time will A beat B

Answer 1

d=200m
speed of a =10m/1sec
time taken by a=200/10=20sec
speed of b=8m/1 sec
time taken by b =200/8=25sec
so a beat b by 5 seconds