Question

Собственная скорость катера 18 км/ч,скорость течения реки 2 км/ч. Какое расстояние проплывёт катер за 2 ч по течению реки? За 3 ч против течения реки?помогите плиз

Answer 1

Calculation of Distance Traveled by the Boat

To calculate the distance traveled by the boat in different scenarios, we need to consider the boat's own speed and the speed of the river current.

1. Distance Traveled with the River Current: - The boat's own speed is 18 km/h, and the speed of the river current is 2 km/h. - When the boat is moving with the current, the effective speed is the sum of the boat's speed and the current speed. - Therefore, the effective speed is 18 km/h + 2 km/h = 20 km/h. - The boat will travel this effective speed for 2 hours. - To calculate the distance traveled, we multiply the effective speed by the time traveled: 20 km/h * 2 h = 40 km.

2. Distance Traveled against the River Current: - When the boat is moving against the current, the effective speed is the difference between the boat's speed and the current speed. - Therefore, the effective speed is 18 km/h - 2 km/h = 16 km/h. - The boat will travel this effective speed for 3 hours. - To calculate the distance traveled, we multiply the effective speed by the time traveled: 16 km/h * 3 h = 48 km.

So, the boat will travel a distance of 40 km with the river current in 2 hours and a distance of 48 km against the river current in 3 hours.