The distance between two trains going in the same direction is 130 km. After 5 hours the distance

The distance between two trains going in the same direction is 130 km. After 5 hours the distance between these trains was reduced to 85 km. The speed of the train, which is moving behind, is 72 km / h. What is the speed of the train in front?

First, let’s find how many kilometers the distance between trains has decreased in 5 hours.

130 – 85 = 45 km.

Let’s find by how many km / h the speed of the train going behind is greater than the speed of the first train.

To do this, we divide 45 km by time.

45/5 = 9 km / h.

Find the speed of the first train.

To do this, subtract the difference from the speed of the second train.

As a result, we get:

72 – 9 = 63 km / h.

Answer:

The speed of the train in front is 63 km / h.