Question

a train moves at a constant speed of 50kmh from station A to station B and returns the same distance at a speed of 75kmh. Calculate the average speed of the train. ​

Answer 1

Answer:

62.5 kilometres per hour

Answer 2

Answer:

Given:-

speed of train in 1st case = 50km/hr

spees of train in 2nd case = 75km/hr

time t1 = d/ 50

time t2 = d/ 75

To find:-

average speed

Formula used:-

v = total distance / total time

Solution:-

V = d + d / t1 + t2

= 2d / { (d/50) + (d/75) }

= 2d / { ( 3d+ 2d)/150 }

= 2d × 150 / 5d

= 60 Km/hr

Explanation:

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