Question

A train covers the first half of the distance
between two stations with a speed of 40 km/h
and the other half with 60 km/h. Then its average
speed is :

Answer 1

Answer:

Avg speed = total distance / total time

since the dist is not give the avg of speed = 40+60/2=50

Explanation:

Answer 2

Answer:

12km/hr

Explanation:

1st half distance in X/20(time)

next half in X/30(time)

total time =5X/60

let total distance isX

so,

av, speed X/5X×60=12km/hr