Question

За 9 часов по течению рекитеплоход проходит тот же путь,что за 11ч против течения.найдите собственную скоростьтеплохода,если скорость течения реки 2км/ч.Мне не нужно решение,можно просто составить условие,я знаю как решать)

Answer 1

Пишешь условие:
пусть х (км/ч) - собственная скорость теплохода, то:
 х + 2 (км/ч) - скорость теплохода по течению реки и х - 2 (км/ч) - скорость теплохода против течения реки, затем составляешь уравнение и решаешь (: 

Answer 2

Problem Statement:

Let's say the speed of the boat is represented by x km/h and the speed of the river's current is 2 km/h. According to the problem, the boat takes 9 hours to travel the same distance downstream as it takes 11 hours to travel the same distance upstream.

Solution:

To solve this problem, we can use the formula:

Distance = Speed x Time

Let's assume the distance traveled by the boat is D.

When the boat is moving downstream, its effective speed is the sum of its own speed and the speed of the current, which is (x + 2) km/h. The time taken to travel the distance D downstream is given as 9 hours.

Therefore, the equation for the downstream journey can be written as:

D = (x + 2) x 9 When the boat is moving upstream, its effective speed is the difference between its own speed and the speed of the current, which is (x - 2) km/h. The time taken to travel the distance D upstream is given as 11 hours.

Therefore, the equation for the upstream journey can be written as:

D = (x - 2) x 11 Now, we can solve these two equations to find the value of x, which represents the speed of the boat.

Let's solve the equations:

(x + 2) x 9 = (x - 2) x 11

Expanding the equation:

9x + 18 = 11x - 22

Rearranging the terms:

22 - 18 = 11x - 9x

Simplifying:

4 = 2x

Dividing both sides by 2:

x = 2

Therefore, the speed of the boat is 2 km/h.

Please note that this solution assumes a constant speed throughout the journey and does not take into account factors such as acceleration or deceleration.

I hope this helps! Let me know if you have any further questions.