Question

If a sprinter runs a distance of 100metres in 9.83 sec calculate his average speed in km/hr

Answer 1

Avg. Speed=Total Distance/Total Time Taken

Avg. Speed=100m/9.83sec

=10.17m/sec

To change m/sec in km/hr multiply m/sec by 18/5 .

To change km/hr in m/sec multiply km/hr by 5/18.

Therefor the answer will be=10.17m/sec * 18/5=36.63 km/hr

Answer 2

s=100m
s=0.1km
t=9.8sec=0.00272hr
so
average speed=diatance÷time
average speed=0.1÷0.00272
average speed=36.76km/hr
hope it helps you