The speed of the boat in still water is 18 km / h. The speed of the river is 2 km / h.
| March 2, 2021 | education
The speed of the boat in still water is 18 km / h. The speed of the river is 2 km / h. How long will the boat take to go 80 km along the river? Upstream of the river?
1) Find out at what speed the boat moves downstream, if its speed is 18 km / h, and the speed of the current is 2 km / h.
18 + 2 = 20 km / h.
2) Let’s find out after what period of time the boat will cover the distance of 80 km going at a speed of 20 km / h.
80/20 = 4 hours.
3) Find out at what speed the boat is moving against the current.
18 – 2 = 16 km / h.
4) Let’s find out after what period of time the boat will cover the distance of 80 km going against the current.
80/16 = 5 hours.
Answer: the boat will cover the distance of 80 km downstream in 4 hours, and upstream in 5 hours.
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