Question

Одновременно от одной пристани в противоположных направлениях, отошли 2 катера. Скорость катера по течению реки 15 км/ч.Какое расстояние будет между ними через 5 часов, если скорость течения реки 3 км/ч.

Answer 1

2*15+3=33(км)
Ответ сам ок?

Answer 2

Problem Analysis

We have two boats departing from the same dock in opposite directions. The speed of one boat relative to the river current is 15 km/h, and the speed of the river current is 3 km/h. We need to calculate the distance between the two boats after 5 hours.

Solution

To find the distance between the two boats after 5 hours, we need to calculate the distance each boat has traveled in 5 hours and then add those distances together.

Let's calculate the distance traveled by each boat:

1. Boat 1 (going downstream): The speed of the boat relative to the river current is 15 km/h, and the speed of the river current is 3 km/h. So the effective speed of the boat downstream is 15 + 3 = 18 km/h. The distance traveled by the boat downstream in 5 hours is 18 km/h * 5 h = 90 km.

2. Boat 2 (going upstream): The speed of the boat relative to the river current is 15 km/h, and the speed of the river current is 3 km/h. So the effective speed of the boat upstream is 15 - 3 = 12 km/h. The distance traveled by the boat upstream in 5 hours is 12 km/h * 5 h = 60 km.

Now, let's calculate the total distance between the two boats after 5 hours:

The distance between the two boats is the sum of the distances traveled by each boat. So the total distance is 90 km + 60 km = 150 km.

Therefore, the distance between the two boats after 5 hours will be 150 km.

Conclusion

The distance between the two boats after 5 hours, with one boat traveling downstream at a speed of 15 km/h and the other boat traveling upstream at a speed of 15 km/h, will be 150 km.