The train, passing 40 km per hour, covered 1/5 of the entire journey in 3 hours. Find the length of the path.

To solve the problem, you first need to find what distance the train traveled in the first 3 hours on the way. To do this, its speed should be, namely 40 km / h multiplied by the period of travel time.
40 * 3 = 120 kilometers.
After we find out how many kilometers are 1/5 of the entire route, in order to determine the entire length of the path, the found distance should be divided by 1/5, or multiplied by 5/1.
In that case, we’ll get.
120/1/5 = 120 * 5/1 = 600 kilometers.
Answer. The length of the entire path is 600 km.