Question

Катер проплыл по течению 2,4ч расстояния 55 1/5 км скорость течения реки 2,5 км/ч найдите собственную скорость катера

Answer 1

1) 55 целых и 1/5 это 55 км 200 м или 55,2 км
2) 55,2/2,4=23 км/ч скорость катера при движении по течению
3) 23-2,5=20,5 км/ч - собственная скорость катера

Answer 2

1) 55 1/5  :  2,4  = 55,2  :2,4= 23 (км/ч) скорость по течению
2) 23 -  2,5 =20,5 (км/ч)  собственная скорость катера

Ответ: 20,5 км/ч  собственная скорость катер

Answer 3

Problem Analysis

We are given the following information: - A boat traveled downstream for 2.4 hours. - The distance traveled by the boat is 55 1/5 km. - The speed of the river's current is 2.5 km/h.

We need to find the speed of the boat.

Solution

Let's assume the speed of the boat is x km/h.

When the boat is traveling downstream, its effective speed is the sum of its own speed and the speed of the river's current. Therefore, the boat's effective speed downstream is (x + 2.5) km/h.

We can use the formula speed = distance / time to find the effective speed downstream.

The distance traveled downstream is given as 55 1/5 km, and the time taken is 2.4 hours.

Using the formula, we can write the equation as:

(x + 2.5) = (55 1/5) / 2.4

Now, let's solve this equation to find the value of x.

Calculation

To solve the equation, we need to convert the mixed fraction into a decimal.

55 1/5 = 55 + 1/5 = 55 + 0.2 = 55.2

Substituting the values into the equation:

(x + 2.5) = 55.2 / 2.4

Simplifying the equation:

(x + 2.5) = 23

Now, let's solve for x:

x = 23 - 2.5

x = 20.5

Answer

The speed of the boat is 20.5 km/h.

Please note that the answer is based on the given information and calculations.