Question

Расстояние в 48 км по озеру моторная лодка преодолевает за 4 часа. Точно такое же расстояние по течению реки она преодолевает за 3 часа. Найдите скорость течения реки. ПОМОГИТЕ ПОЖАЛУЙСТА!!! СРОЧНО!!!

Answer 1

1)48/3=16-ск. по течению
2)48/4=12-ск.против течения
3)16-12=4-ск. реки
4)4/2=2-собств ск реки

Answer 2

Calculating River Current Speed

To find the speed of the river's current, we can use the concept of relative speed. When the boat travels upstream or downstream in a river, its speed is affected by the speed of the river's current.

Let's denote: - Speed of the boat in still water as B - Speed of the river's current as R

When the boat travels downstream (in the direction of the current), the effective speed is the sum of the boat's speed and the current's speed: B + R

When the boat travels upstream (against the current), the effective speed is the difference between the boat's speed and the current's speed: B - R

Given: - Distance = 48 km - Time downstream = 3 hours - Time upstream = 4 hours

We can use the formula: Speed = Distance / Time

Calculating Downstream Speed

Using the formula, the boat's speed downstream is: B + R = 48 km / 3 hours

Calculating Upstream Speed

Similarly, the boat's speed upstream is: B - R = 48 km / 4 hours

Solving for Boat's Speed and River's Current Speed

We have two equations: 1. B + R = 48 / 3 2. B - R = 48 / 4

By solving these equations simultaneously, we can find the values of B and R.

Let's calculate the boat's speed and the river's current speed.