The distance between the two berths is 36 km. How much time will the boat spend on the way from one berth

| March 19, 2021 | education

The distance between the two berths is 36 km. How much time will the boat spend on the way from one berth to the other and back, if its own speed is 15 km / h, and the speed of the river flow is 3 km / h.

1) Find the speed of the boat along the river.

To do this, add the speed of the river to the boat’s own speed.

Will be:

15 + 3 = 18 km / h.

2) Determine the time it takes for the boat to travel the specified distance between the marinas along the river.

We divide the distance by the speed.

We get:

36/18 = 2 hours.

3) Find the speed of the boat against the stream of the river.

We subtract the current speed from the boat’s own speed.

15 – 3 = 12 km / h.

4) Determine the time of movement against the stream of the river.

36/12 = 3 hours.

5) Find the total time for the entire journey.

3 + 2 = 5 hours

Answer: 5 hours.



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