Question

A train covers the first half of the distance
between two stations with a speed of 40 km/h
and the other hall with 60 km/h. Then its average
speed is :
(1) 50 km/h
(2) 48 km/h
(3) 52 km/h
(4) 100 km/h​

Answer 1

Answer:

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Answer 2

Let its total distance be x km

Thrn in first half distance is x/2 km

Speed is 40km/hr

So,thr time is x/80 secs

Similarly in the second half time is

x/120 secs

Now, averagd speed =total distance/total time

=>average speed=x/(x/80+x/120)

=>average speed=x/(5x/240)

=>averagd speed=>x×240/5x

=>average spred=48km

=>average speed=x/