The boat runs along the river between the two cities, the distance between which is 63 km.

| August 10, 2021 | education

The boat runs along the river between the two cities, the distance between which is 63 km. The boat’s own speed is 15 km / h and the current speed is 6 km / h. Find how much time the boat will spend on one trip back and forth?

I.

1) Find out how long it will take for the boat to cover the distance of 63 km, moving along the river (there), if it is known that the boat’s own speed is 15 km / h, and the speed of the river is 6 km / h.

63: (15 + 6) = 3 hours.

2) Find out how long it will take for the boat to cover the distance of 63 km, moving against the river flow (back), if it is known that the boat’s own speed is 15 km / h, and the river speed is 6 km / h.

63: (15 – 6) = 7 hours.

3) Find out how much time the boat will spend on one round trip.

3 + 7 = 10 hours.

II.

You can compose an expression and solve the problem by finding its meaning.

63: (15 + 6) + 63: (15 – 6) = 10 hours.

Answer: the boat will spend 10 hours on one round trip.



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