Question

A train travels from Agra to Delhi with a constant speed of 50 kilometre per hour and returns from Delhi to Agra with a constant speed of 40 kilometre per hour. find the average speed of the train.

Answer 1

Answer:

The average speed is 45kmph as 40+50/2=45

Answer 2

Explanation:

Given :

Let the distance b/w Agra to delhi = x km

so time taken = x/ 50 hr.

and time taken b/w delhi to Agra = x/ 40 hr.

so , Average speed = Total distance/ total time

Total distance= x + x = 2x km

Total time = x/50+ x/40 hr.

= 9x/200 hr

so, Avg. speed =. (2x /9x )* 200

=400/9 hr.