Let’s find out how fast the boat was going along the river.
We divide the traversed path by time.
30/2 = 15 km / h.
Determine its speed in the opposite direction.
Divide 30 km by 3 hours.
30/3 = 10 km / h.
The boat’s own speed is the arithmetic mean of its speed in each direction, so we get:
(15 + 10) / 2 = 25/2 = 12.5 km / h.
Answer: The boat’s own speed is 12.5 km / h.
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