Observing a uniformly moving train from the platform, the boy determined that the train passed

Observing a uniformly moving train from the platform, the boy determined that the train passed him in 24 seconds, and past the entire platform 120 m long in 40 seconds. What is the speed of the train?

These tasks: t1 (time for the train to pass the boy) = 24 s (the train traveled a distance equal to its own length); t (time for the train to pass the platform) = 40 s; L (platform length) = 120 m.

1) Determine the time spent by the train to travel a distance equal to the length of the platform: t2 = t – t1 = 40 – 24 = 16 s.

2) Let’s calculate the speed of the train: V = L / t2 = 120/16 = 7.5 m / s.

Answer: The train passed the platform at a speed of 7.5 m / s.