The boat passed along the river from one pier to another 112 km and returned back. The boat’s own speed is 17 km / h

| July 2, 2021 | education

The boat passed along the river from one pier to another 112 km and returned back. The boat’s own speed is 17 km / h, the current speed is 3 km / h. Find the average speed of the boat.

1) Find out the speed of the boat downstream: 17 + 3 = 20 (km / h);
2) Determine the time that the boat went along the river: 112: 20 = 5.6 (h);
3) Find the speed of the boat against the current: 17 – 3 = 14 (km / h);
4) Let’s calculate the time that the boat spent on the way upstream of the river: 112: 14 = 8 (h);
5) Find the total distance covered by the boat: 112 • 2 = 224 (km);
6) Determine the total time of the boat on the way: 5.6 + 8 = 13.6 (h);
7) Let’s calculate the average speed of the boat: 224: 13.6 = 16, 470 = 16.5 (km / h).
Answer: the average speed of the boat is 16.5 km / h.



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