Question

Из двух городов по реке одновременно выплыли навстречу друг йдругу два катера. Скорость первого катера15 км/ч,а второго ка тера 35км/ч. первый катер двиголся по течению реки. скорость течения реки 5км.ч а . через сколько часов катера встретились, если расстояние между городами 250 км

Answer 1

Скорость 1 катера по течению равна 15+5=20км/ч
Скорость 2 катера против течения равна 35-5=30км/ч
Общая скорость равна 30+20=50км/ч
Время через сколько они встретятся 250:50=5ч

Answer 2

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.

Let's break down the information given: - The speed of the first boat is 15 km/h. - The speed of the second boat is 35 km/h. - The speed of the river current is 5 km/h. - The distance between the two cities is 250 km.

Calculating the Time of Meeting:

To find out when the two boats will meet, we need to calculate the time it takes for them to cover the distance between the cities.

Let's assume that the time taken by both boats to meet is 't' hours.

The distance covered by the first boat in 't' hours is given by the formula: distance = speed * time. For the first boat, the distance covered is (15 km/h + 5 km/h) * t, as it is moving with the current of the river.

The distance covered by the second boat in 't' hours is given by: distance = speed * time. For the second boat, the distance covered is (35 km/h - 5 km/h) * t, as it is moving against the current of the river.

Since the total distance between the cities is 250 km, we can set up the equation: (15 km/h + 5 km/h) * t + (35 km/h - 5 km/h) * t = 250 km.

Simplifying the equation: 20 km/h * t + 30 km/h * t = 250 km. 50 km/h * t = 250 km.

Now, we can solve for 't': t = 250 km / 50 km/h. t = 5 hours.

Answer:

The two boats will meet after 5 hours.

Please let me know if you need any further assistance!