Question

A train runs between two stations A and B.
While going from A to B, its average speed is
100 km/hr and white coming back from B to A,
its average speed is 150 km/hr. Find average
speed during whole journey
a) 100
b) 120
c) 70
d) 115
​

Answer 1

Step-by-step explanation:

let distance between a and b is x

so average speed is

total distance/total time

(x+x)/(x/100+x/150)

2x/{(3x+2x)/300}

2x/{5x/300)

2x/{x/60}

(2x*60)/x

2*60

120(ans)

please mark it brainliest