The boat sailed 72 km along the river and returned back. How long did it take it if the boat’s
| January 18, 2021 | education
The boat sailed 72 km along the river and returned back. How long did it take it if the boat’s own speed is 21 km / h and the river speed is 3 km / h?
21 + 3 = 24.
24 km / h – the rate of movement with the river.
21 – 3 = 18.
18 km / h – pace of movement against the river.
72/24 = 3.
3 hours – travel time of the boat with the river.
72/18 = 4.
4 hours travel time of the boat against the river.
4 – 3 = 1.
The return trip took 1 hour longer.
Solution: 1 hour longer.
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