Question

Собственная скорость катера 15км/ч. Скорость течения реки - 2,5км/ч . Сколько всего километров пройдёт катер за 3 часа по течению реки и 1,5 часа против течения реки?

Answer 1

S = v * t

1) (15 + 2,5) * 3 = 52,5 (км) - пройдёт катер по течению реки

2) (15 - 2,5) * 1,5 = 18,75 (км) - пройдёт катер против течения реки

3) 52,5 + 18,75 = 71,25 (км) - всё расстояние за 4,5 часа

Answer 2

Calculation of the Distance Traveled by the Boat

To calculate the total distance traveled by the boat, we need to consider the time spent traveling with the current and against the current separately.

Given: - Boat's own speed: 15 km/h - Speed of the river current: 2.5 km/h - Time spent traveling with the current: 3 hours - Time spent traveling against the current: 1.5 hours

To calculate the distance traveled with the current, we can use the formula: distance = speed × time.

1. Distance traveled with the current: - Speed of the boat with the current = Boat's own speed + Speed of the river current = 15 km/h + 2.5 km/h = 17.5 km/h. - Time spent traveling with the current = 3 hours. - Distance traveled with the current = Speed × Time = 17.5 km/h × 3 hours = 52.5 km.

2. Distance traveled against the current: - Speed of the boat against the current = Boat's own speed - Speed of the river current = 15 km/h - 2.5 km/h = 12.5 km/h. - Time spent traveling against the current = 1.5 hours. - Distance traveled against the current = Speed × Time = 12.5 km/h × 1.5 hours = 18.75 km.

Therefore, the boat will travel a total distance of 52.5 km with the current and 18.75 km against the current.

Please note that these calculations assume a constant speed of the boat and the river current throughout the entire journey.