# The boat covered the distance between the piers along the river in 2 hours, and the return trip took 2.5 hours

August 28, 2021 | education

| **The boat covered the distance between the piers along the river in 2 hours, and the return trip took 2.5 hours. The current speed is 2 km / h. Find the distance between the marinas.**

The solution of the problem:

Let the distance between the marinas be x.

Then the speed of the boat along the river is x / 2.

And the speed of the boat against the stream of the river is x / 2.5.

The speed of the river flow is equal to half the difference between the speed of the boat along the river and the speed of the boat against the current of the river, we get the equation:

(x / 2 – x / 2.5) / 2 = 2;

2.5x / 5 – 2x / 5 = 2 * 2 = 4;

0.5x / 5 = 4;

0.5x = 20;

x = 40 (km) – distance between quays.

Answer: The distance between the marinas is 40 km.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.