Question

a bus travels s distance of 120km with a speed of 40kmph and returns with a speed of 30kmph. calculate average speed​

Answer 1

average speed = total distance/total time

120+120/t1+t2

240/(120/40)+(120/40)

240/3+4

240/7

=34.2kmph

Answer 2

distance of the bus=120km.

speed of a bus=40kmph.(v1)

speed of a bus=30kmph.(v2)

=120÷40+30

=120÷70

=1.78

the average speed of a bus is 1.78