Question

a boy walks to his school at a distance of 6 km with constant speed of 2.5 km per hour and walks back with a constant speed of 4 kilometre per hour his average speed of a round trip expressed in kilometre per hour is​

Answer 1

Answer:

3.07km/hr

Explanation:

s=d/t

t=d/s

case 1

t = 6/2.5= 2.4

case 2

t=6/4 = 1.5

avg speed = total distance/total time

                 =(6+6)/(2.4+1.5)

                 =12/3.9

                 =3.07 km/hr