The speed of the boat when moving along the current is 15 km / h. The speed of the river is 4 km / h. you will find the speed of the boat when moving against the current of the river.
1) Let’s find out what speed the boat develops in still water, if it is known that sailing along the river its speed is 15 km / h, and the speed of the river is 4 km / h.
15 – 4 = 11 km / h.
2) Let’s find out what speed the boat has when sailing against the stream of the river, if it is known that in stagnant water it develops a speed of 11 km / h, and the speed of the river flow is 4 km / h.
11 – 4 = 4 km / h.
Answer: sailing against the stream of the river, the boat develops a speed of 7 km / h.
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