Question

A train travels some distance with a speed of 30km and returns wuth speed of 45km/h calculate av speed of train

Answer 1

av speed = 30+45/2
=75/2
=37.5 km/hr

Answer 2

Given,speed 1=30km/hr
speed 2=45km/he
Time taken=x
Therefore,av speed = total displacement covered÷total time take

=0/x
(displacement= 0,
because the train
comes back to
its original
position)

=0km/hr

Therefore, average speed =0(km/hr)