The distance from one pier on the river to another is a motor ship takes 4 hours, and back in 3 hours.
| January 1, 2021 | education
The distance from one pier on the river to another is a motor ship takes 4 hours, and back in 3 hours. Find your own speed of the ship if the river speed is 3 km / h.
Let the speed of the ship be x km / h, then we compose and solve the equation:
(x + 3) * 3 = (x – 3) * 4
3x + 9 = 4x – 12
21 = x
Answer: the speed of the ship is 21 km / h.
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