Question

A 75-meter-long train passes by a man standing on the platform in 3 seconds. How many kilometers is the train speed per hour?​

Answer 1

Correct Answer:

13.5 sec.

Answer 2

Answer:

25m/sec

Step-by-step explanation:

let train is moving with the speed of x

then boy also appears to move with respect to train with same speed...

so we get the speed of boy as:

Given;

length of train(distance)=75 m

time= 3 sec

.•. speed = distance/time

= 75/3 =25

speed of boy= 25m/sec

=> speed of train =speed of boy

= 25m/sec