Question

A train travels with a speed of 60km/h from station A to station B and then comes back with a speed 80km/h from station B to station A. Find:  (i) the average speed, and (ii) the average velocity of train.

Answer 1

the average speed of the train is = speed of train from A to B+speed of train from                                                     B to A by 2=60+80/2=140/2=70
the average velocity of the train is 0
Average velocity=Displacement/time
                       =0/time
                       =0

Answer 2

Answer:68.57 km/hr

Explanation:

Let the distance be x

Time taken = x/60+x/80

Total time =

Take the LCM of the both denominator

4x+3x/240 = 7x/240

Average speed =2x/7x/240

= 2x ×240 /7x

= 480/7

= 68.57 km/ hr