The own speed of the motor boat is 21 3/8 km / h and the speed of the river is 1 3/4 km / h.
| May 2, 2021 | education
The own speed of the motor boat is 21 3/8 km / h and the speed of the river is 1 3/4 km / h. Find the speed of the boat downstream of the river, its speed upstream.
Let’s solve the problem by successively finding the required values.
1) Let’s calculate the speed of a motor boat along the river:
21 3/8 + 1 3/4 = 129/8 + 7/4 = 129/8 + 14/8 = 143/8 = 17.875 km / h.
2) Let’s calculate the speed of the motor boat against the river flow:
21 3/8 – 1 3/4 = 129/8 – 7/4 = 129/8 – 14/8 = 115/8 = 14.375 km / h.
Answer: The speed of the boat along the river is 17.875 km / h, the speed of the boat against the river is 14.375 km / h.
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