When moving against the flow of the river, the distance of 60 km is covered by the motor ship in 4 hours.

When moving against the flow of the river, the distance of 60 km is covered by the motor ship in 4 hours. What is the speed of the river flow, if the own speed of the motor ship is 16 km / h.

To begin with, we find out at what speed the motor ship was sailing against the stream of the river, if, according to the terms of the task, it is known that it sailed 60 km in 4 hours:
S = V * T, where V is speed, T is time.
V = S / T = 60/4 = 15 km / h.
Now let us determine what the river flow rate is equal to if it is known from the problem statement that the motor ship’s own speed is 16 km / h:
We use the formula.
Decreased – Subtracted = Difference.
16 – 15 = 1 km / h.
Answer: the speed of the river is 1 km / h.