# The speed of the boat when moving along the current is 15 km / h. The speed of the river is 4 km / h.

August 31, 2021 | education

| **The speed of the boat when moving along the current is 15 km / h. The speed of the river is 4 km / h. you will find the speed of the boat when moving against the current of the river.**

1) Let’s find out what speed the boat develops in still water, if it is known that sailing along the river its speed is 15 km / h, and the speed of the river is 4 km / h.

15 – 4 = 11 km / h.

2) Let’s find out what speed the boat has when sailing against the stream of the river, if it is known that in stagnant water it develops a speed of 11 km / h, and the speed of the river flow is 4 km / h.

11 – 4 = 4 km / h.

Answer: sailing against the stream of the river, the boat develops a speed of 7 km / h.