From the two piers, the distance between which is 140 km, two boats leave towards each other.

| April 9, 2021 | education

From the two piers, the distance between which is 140 km, two boats leave towards each other. The speed of which in still water is the same and is equal to 35 km / h. The speed of the river is 3 km / h. In how many hours will they meet?

Since the boats were going towards each other, one of them was going along the river, and the other was going against the current.

1) Determine the speed of the boat going against the stream of the river: 35 – 3 = 32 (km / h);

2) Find out at what speed the second boat was going – along the river: 35 + 3 = 38 (km / h);

3) Let’s calculate the speed of approach of boats. To do this, we find the sum of their speeds: 32 + 38 = 70 (km / h);

4) Find the time after which the boats will meet. To do this, we calculate the quotient of the distance between the marinas and the approach speed: 140: 70 = 2 (h).

Answer: the boats will meet in 2 hours.



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