The boat, moving against the stream of the river, covered 55.08 km in 3, 6 hours.

The boat, moving against the stream of the river, covered 55.08 km in 3, 6 hours. Find the current speed if the boat’s own speed is 18.7 km / h.

1. In order to calculate the speed of the boat against the current of the river, recall the formula for finding the path:

S = v * t.

From this formula, we express the speed:

v = S / t.

So, let’s calculate the speed of the boat against the current, if we know that in 3.6 hours, she swam 55.08 km.

55.08 / 3.6 = 15.3 km per hour.

2. Now we can find out what the current speed is equal to, since from the problem statement we know that the boat’s own speed is 18.7 km per hour.

18.7 – 15.3 = 3.4 km per hour.

Answer: The speed of the river is 3.4 km per hour.