The train moves at a constant speed of 57 km h. A pedestrian is moving towards it at a speed of 3 km h.

The train moves at a constant speed of 57 km h. A pedestrian is moving towards it at a speed of 3 km h. The train passed the pedestrian in 18 seconds. how many meters is the train long?

v1 = 57 km / h – train speed:
v2 = 3 km / h – the speed of the pedestrian;
The train and the pedestrian are moving towards each other, so we add up their speeds:
v = v1 + v2 = 57 + 3 = 60 km / h.

Let’s translate the obtained speed value into m / s:
v = 60 km / h = 16.666667 m / s.

Let’s find the length of the train. It is equal to the distance that the pedestrian and the train covered in 18 seconds:
L = S = v * t = 16.666667 * 18 = 300 m.

Answer: the length of the train is 300 meters.