Question

A child runs at a speed of 10metre per second. How much Time will he take to cover distance of 1km?

Answer 1

here, speed is 10m per sec. now,speed equals to distance by time..so time equals...distance by speed...therfore..1000m divided by 10m per sec equals to 100min.

Answer 2

We have given 
speed=10m/s
distance=1km=1000m
We know 
speed = distance/time
time=distance/speed
        =1000/10=100
time=100s