Question

Двигаясь против течения реки теплоход за 3 часа прошел 63 километра какова скорость течения реки если собственная скорость теплохода 23 километра в час

Answer 1

1)63:3=21 км / час - скорость против течения реки
2) 23-21=2 км/ час - скорость течения реки
Ответ: 2 км/ час.

Answer 2

Problem Analysis

We are given the following information: - The boat is moving against the current of a river. - The boat traveled 63 kilometers in 3 hours. - The speed of the boat is 23 kilometers per hour.

We need to find the speed of the river's current.

Solution

Let's assume the speed of the river's current is x kilometers per hour.

When the boat is moving against the current, its effective speed is reduced by the speed of the current. Therefore, the boat's effective speed can be calculated as the difference between its actual speed and the speed of the current.

The boat traveled 63 kilometers in 3 hours, so its effective speed is 63 kilometers divided by 3 hours, which is 21 kilometers per hour.

Using this information, we can set up the following equation:

Boat's effective speed = Boat's speed - Speed of the current

Substituting the given values:

21 kilometers per hour = 23 kilometers per hour - x kilometers per hour

Now, we can solve this equation to find the value of x.

Calculation

To solve the equation, we can subtract 23 kilometers per hour from both sides:

21 kilometers per hour - 23 kilometers per hour = -x kilometers per hour

Simplifying the left side of the equation:

-2 kilometers per hour = -x kilometers per hour

To isolate x, we can multiply both sides by -1:

2 kilometers per hour = x kilometers per hour

Answer

The speed of the river's current is 2 kilometers per hour.

Please let me know if I can help you with anything else.