The boat’s own speed is 8.5 km / h, the speed of the river is 1.5 km / h.

| February 1, 2021 | education

The boat’s own speed is 8.5 km / h, the speed of the river is 1.5 km / h. The distance between the marinas is 17.5 km. How long will it take for the boat to sail this distance if it floats along the river?

In problems with the flow of a boat, the speed along the river will always be equal to the sum of its own speed and the speed of the current, while when moving against the current, the speed is equal to the difference between the own speed and the speed of the river.
The total speed will be: 8.5 + 1.5 = 10 km / h
To find the time, you need to divide the distance by the path:
17.5 / 10 = 1.75 h
Now you need to translate 1.75 hours into a normal form, since this is not used in speech.
0.75 h = 0.75 * 60 = 45 min
Answer: in 1 hour 45 minutes the boat will sail along the river.



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