Two trains started moving in opposite directions at the same time. one was moving at a speed 30 km / h

Two trains started moving in opposite directions at the same time. one was moving at a speed 30 km / h less than the other. How far will the trains be from each other in 4 hours if the speed of the other train is 130 km / h?

Since one train was moving slower by 30 km / h, its speed will be:

130 – 30 = 100 km / h.

Since the trains were moving in different directions relative to each other, the removal speed will be equal to the sum of their speeds:

100 + 130 = 230 km / h.

Then after 4 hours there will be a distance between them:

4 * 230 = 920 km.