Question

A girl walks 12 km at the speed of 3 km/h.What change should she make in her speed to take an hour less and an hour more to covet the distance​

Answer 1

Step-by-step explanation:

Distance=12km

speed(1)=3km/hr

so time taken is

T=d/s

=12/3=4 hrs

now she has to cover 12km in 4-1=3hrs

so new speed = d/time

=12km/3hrs

=4km/hr

now she has to cover 12 I'm in 4+1=5hrs

so new speed =d/time

=12km/5hrs

=2.4km/hr