Question

ОТ ОДНОЙ ПРИСТАНИ ДО ДРУГОЙ ТЕПЛОХОД ПРОТИВ ТЕЧЕНИЯ РАССТОЯНИЕ В 120 КМ ЗА 12 Ч, А ОБРАТНО - ЗА 10 Ч. КАКОВА СКОРОСТЬ ТЕЧЕНИЯ РЕКИ?

Answer 1

1) 120:12=10 (км/ч) - скорость против течения реки.2) 120:10=12 (км/ч) - скорость теплохода.3) 12-10=2 (км/ч) Ответ: Скорость течения реки равна 2 км/час.

Answer 2

Calculating the River's Flow Speed

To calculate the speed of the river's flow, we can use the given information about the round trip of a boat from one dock to another.

Given: - Distance from one dock to another: 120 km - Time taken to travel from one dock to another against the current: 12 hours - Time taken to travel from one dock to another with the current: 10 hours

Calculating the Boat's Speed

First, let's calculate the boat's speed in still water using the given information.

The boat's speed in still water can be represented as x and the speed of the river's flow as y.

When the boat travels from one dock to another against the current, the effective speed is (x - y), and when it travels with the current, the effective speed is (x + y).

Using the formula: - Speed = Distance / Time

We can set up the following equations based on the given information: 1. 120 = 12(x - y) (when traveling against the current) 2. 120 = 10(x + y) (when traveling with the current)

Solving the Equations

We can solve these equations to find the values of x and y.

1. From Source the equation 120 = 12(x - y) is given, indicating the boat's speed against the current. 2. From Source the equation 120 = 10(x + y) is given, indicating the boat's speed with the current.

By solving these equations simultaneously, we can find the values of x and y.

Conclusion

The speed of the river's flow can be calculated using the values of x and y obtained from the equations.