Question

A train travels some distance with a speed of 30 km/hr
and returns with a speed of 45 km/hr. calculate the
average speed the train.​

Answer 1

Answer:

Explanation:

hi friend, let d/2 be the distance covered by train with a speed of 30kmph in t1 hours

→t1=d/60

it covers d/2 distance with a speed of 45km/h in t2 hours

→t2=d/90

average speed = total distance/total time

=d/(t1+t2)

=1/(1/60+1/90)

=1/(3+2)/180

=180/5=36kmph

I hope this will help u ;)

Answer 2

Answer:

body moveing in a straight line then this formula can be used