A man walks at a speed of 5 km / h along the railroad tracks. Two trains move along these tracks: the first has 30 carriages

A man walks at a speed of 5 km / h along the railroad tracks. Two trains move along these tracks: the first has 30 carriages, and the second has 25 cars. The man noticed that the head carriages of the trains caught up with each other opposite him, and the last carriages also diverged opposite him. It is known that trains moved at the same speed in absolute value. Find the modulus of this speed in m / s.

Given:
V person = 5 km / h;
S of the first train = 30 cars;
S of the second train = 25 cars.
Decision:
1) Find the difference between the length of the trains.
30-25 = 5 cars.
2) Due to the fact that the trains move at the same speed, then (30-25) * 5 * 2 = 50 km / h
Answer: 50