Question

Катер шел 0,4 ч по озеру и 0,3 ч по течению реки, скорость течения которой 2 км/ч. всего катер прошел 9 км. Найдите собственную скорость катера. помогите пожалуйста​

Answer 1

Ответ:

Пошаговое объяснение:

скорость катера х

скорость катер.по течен. реки х+2

тогда путь 0,4×х+0,3(х+2)=9

0,7х=8,4 ,х=12км/час

Answer 2

Calculating the Boat's Speed

To find the boat's speed, we can use the formula: Total distance = Boat's speed * Time on still water + (Boat's speed - River's speed) * Time against the current

Given: - Time on still water = 0.4 hours - Time against the current = 0.3 hours - River's speed = 2 km/h - Total distance = 9 km

Using the formula, we can set up the following equation: 9 = Boat's speed * 0.4 + (Boat's speed - 2) * 0.3

Solving for the Boat's Speed

Let's solve the equation to find the boat's speed: 9 = 0.4s + 0.3(s - 2)

First, we'll distribute the terms: 9 = 0.4s + 0.3s - 0.6

Combining like terms: 9 = 0.7s - 0.6

Adding 0.6 to both sides: 9 + 0.6 = 0.7s 9.6 = 0.7s

Now, we'll solve for s: s = 9.6 / 0.7 s ≈ 13.71

Answer

The boat's speed is approximately 13.71 km/h.