Question

с одновременно вышли навстречу друг другу две моторные лодки Скорость первой лодки 15 км ч второго 35 км ч 1 лодка двигалась по течению реки скорость течения реки 5 км ч через сколько часов лодки встретились если расстояние между городами 250 км

Answer 1

1)15+5=20(км/ч)-скорость первой лодки.

2)35-5=30(км/ч)-скорость второй лодки.

3)20+30=50(км/ч)-скорость вся.

4)250:50=5

Ответ: через 5

Answer 2

1)15+5=20(км/ч)-скорость первой лодки;                                                             2)35-5=30(км/ч)-скорость второй лодки;                                                   3)20+30=50(км/ч)-общая скорость;                                                                 4)250:50=5(ч)                                                                                              Ответ:через 5 часов лодки встретятся.

Answer 3

Problem Analysis

We have two motorboats traveling towards each other. The first boat has a speed of 15 km/h, while the second boat has a speed of 35 km/h. The first boat is moving with the current of the river, which has a speed of 5 km/h. We need to determine how many hours it will take for the boats to meet if the distance between the cities is 250 km.

Solution

To solve this problem, we can use the concept of relative speed. The relative speed is the difference between the speeds of the two objects moving towards each other. In this case, the relative speed of the two boats is the sum of their speeds.

Let's calculate the relative speed of the two boats:

Relative speed = Speed of the first boat + Speed of the second boat

Relative speed = 15 km/h + 35 km/h

Relative speed = 50 km/h

Now, we can calculate the time it will take for the boats to meet by dividing the distance between the cities by the relative speed:

Time = Distance / Relative speed

Time = 250 km / 50 km/h

Time = 5 hours

Therefore, it will take 5 hours for the boats to meet.

Answer

The two motorboats will meet after 5 hours of traveling.