The speed of the ship along the river is 42.8 km / h. The current speed is 2.8 km / h.

The speed of the ship along the river is 42.8 km / h. The current speed is 2.8 km / h. Find your own speed of the ship and its speed upstream.

The solution of the problem:
1. Let us find the own speed of the motor ship if we know its speed along the river and the speed of the river.
42.8 – 2.8 = 40 kilometers.
2. Let’s calculate the speed of the ship against the river flow.
40 – 2.8 = 37.2 kilometers.
Answer: The own speed of the ship is forty kilometers per hour, and the speed against the flow of the river is thirty-seven kilometers and two hundred meters per hour.