Question

Скорость лодки по течению реки 18 километров в час а против течения 15 километров час Найдите собственную скорость лодки и скорость течения реки

Answer 1

Пусть х - собственная скорость лодлодки, у - скорость течения. Тогда получаем систему: х+у=18, х-у=15. Решаем систему и получаем 2х=33, 2у=3. В итоге получаем х=16,5 км/ч, у=1,5 км/ч. Ответ: 16,5 км/ч, 1,5 км/ч.

Answer 2

Calculating Boat's Speed and River's Current Speed

To find the boat's speed and the river's current speed, we can use the following formulas:

1. Boat's speed + Current speed = Speed downstream 2. Boat's speed - Current speed = Speed upstream

Let's denote the boat's speed as B and the river's current speed as C.

From the given information: - Speed downstream = 18 km/h - Speed upstream = 15 km/h

Using the above formulas, we can set up the following equations: 1. B + C = 18 2. B - C = 15

Adding these two equations together, we get: 2B = 33

So, the boat's speed (B) is: B = 33 / 2 = 16.5 km/h

Substituting the value of B into the first equation: 16.5 + C = 18 C = 18 - 16.5 = 1.5 km/h

Therefore, the boat's speed is 16.5 km/h and the river's current speed is 1.5 km/h.