Question

Помогите пожалуйста! Лодка проплыла по течению реки 4 часа и 2 часа против течения и проплыла 48 км найдите собственную скорость лодки, если скорость течение 3км/ч Если можете остальные помочь вк: id331316478

Answer 1

4 * (v + 3) + 2 * (v - 3) = 48
4v + 12 + 2v - 6 = 48
6v + 6 = 48
6v = 48 - 6
6v = 42
v = 42 : 6
v = 7 км/ч скорость лодки собственная

Answer 2

Calculating the Boat's Speed

To calculate the boat's speed, we can use the formula: Boat's speed = (Distance traveled in still water) / (Time taken in still water).

Given: - Time taken with the current = 4 hours - Time taken against the current = 2 hours - Distance traveled in both cases = 48 km - Speed of the current = 3 km/h

Calculating the Boat's Speed in Still Water

Let's denote the boat's speed in still water as B.

When traveling with the current: - Boat's speed = B + 3 (speed of the current) - Time = 4 hours - Distance = 48 km

When traveling against the current: - Boat's speed = B - 3 (speed of the current) - Time = 2 hours - Distance = 48 km

Calculations

Using the formula distance = speed × time: 1. When traveling with the current: - (B + 3) × 4 = 48 - B + 3 = 48 / 4 - B + 3 = 12 - B = 12 - 3 - B = 9 km/h.

2. When traveling against the current: - (B - 3) × 2 = 48 - B - 3 = 48 / 2 - B - 3 = 24 - B = 24 + 3 - B = 27 km/h.

Conclusion

The boat's speed in still water is 9 km/h.