The speed of the motor boat downstream 36.5 km / h, the speed of the current is 2.7 km / h.

The speed of the motor boat downstream 36.5 km / h, the speed of the current is 2.7 km / h. Determine how far the boat will go if it will sail 2 hours against the river and 3 hours in the lake.

1) Find the boat’s own speed. It is necessary to subtract the speed of the river from the speed of the boat along the river.

36.5 – 2.7 = 33.8 (km / h).

2) Find the speed of the boat against the current of the river. It is necessary to subtract the speed of the river from its own speed.

33.8 – 2.7 = 31.1 (km / h).

3) Find the distance traveled by the boat in 2 hours against the river. To find the path traveled, you need to multiply the speed by time.

31.1 * 2 = 62.2 (km).

4) Find the distance traveled by the boat on the lake. The speed of the boat in still water (standing water in the lake) is equal to the boat’s own speed.

33.8 * 3 = 101.4 (km).

5) Find the distance traveled by the boat in 2 hours against the river and 3 hours on the lake.

62.2 + 101.4 = 163.6 (km).

Answer. 163.6 kilometers.