Question

A train covers half of its journey with a speed of 30 m/s and the other half with a speed of 40 m/s. Calculate the average speed of the train during the whole journey.

Answer 1

Answer: 35 m/s

Explanation:

Speed of the train in the first half of the journey = 30 m/s

Speed of the train in the second half of the journey = 40 m/s

Therefore,

Average speed of the train = {(30+40)/2} m/s

= 35 m/s

Hope this helps!!

Answer 2

Answer:

17.14 m/s

Explanation:

let total distance =x

time1 =x/30

time2= x/40

total time =7x/140

average speed = total distance / total time

= (x / 7x ) × 120 = 17.14 m/s

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