The boat’s own speed is 15.1 / 2km / h. The speed of the river flow

| May 21, 2021 | education

The boat’s own speed is 15.1 / 2km / h. The speed of the river flow is 2.1 / 4 km / h, how long will the boat sail the distance of 71 km if it floats along the river?

Let us find the value of the speed of this boat along the river, for this it is necessary to add the value of the speed of the river to the value of the own speed of this boat:

15 1/2 + 2 1/4 = 17 3/4 km / h – the value of the downstream speed for this boat;

Let’s find the time for which this boat will pass the specified distance along the river, for this it is necessary to divide the distance by the value of the speed along the river of the given boat:

71: 17 3/4 = 71: 71/4 = in 4 hours this boat will cover the specified distance.

Answer: this boat will cover the specified distance in 4 hours.



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