Question

Пж помогите .Теплоход скорость которого неподвижно воде ровна 24км/ч,проходит по течению реки и после стоянки возвращается в исходный пункт.Скорость течения ровна 3км/ч , стоянка длиться 2ч,а расстояние между пунктами следования равно 378 км.Сколько часов теплоход находился в рейсе.

Answer 1

Ответ:

20ч

Пошаговое объяснение:

1) 378/(24-3)=18ч-в пути

2) 18+2=20ч

Answer 2

Problem Analysis

To solve this problem, we need to determine the total time the boat spent on its journey, considering its speed, the speed of the current, and the duration of the stop. We are given the following information: - The speed of the boat in still water is 24 km/h. - The speed of the current is 3 km/h. - The duration of the stop is 2 hours. - The distance between the starting and ending points is 378 km.

Solution

To find the total time the boat spent on its journey, we can break down the journey into three parts: the time spent traveling downstream, the time spent at the stop, and the time spent traveling upstream.

1. Time spent traveling downstream: - The effective speed of the boat when traveling downstream is the sum of its speed in still water and the speed of the current: 24 km/h + 3 km/h = 27 km/h. - The distance traveled downstream is half of the total distance, as the boat returns to the starting point after the stop: 378 km / 2 = 189 km. - The time spent traveling downstream is the distance divided by the speed: 189 km / 27 km/h = 7 hours.

2. Time spent at the stop: 2 hours.

3. Time spent traveling upstream: - The effective speed of the boat when traveling upstream is the difference between its speed in still water and the speed of the current: 24 km/h - 3 km/h = 21 km/h. - The distance traveled upstream is also half of the total distance: 189 km. - The time spent traveling upstream is the distance divided by the speed: 189 km / 21 km/h = 9 hours.

To find the total time spent on the journey, we add the time spent traveling downstream, the time spent at the stop, and the time spent traveling upstream: 7 hours + 2 hours + 9 hours = 18 hours.

Therefore, the boat spent 18 hours on its journey.

Conclusion

The boat spent a total of 18 hours on its journey, considering its speed, the speed of the current, and the duration of the stop.