Question

Скорость катера в стоячей воде равна 12км/ч, а скорость т ечения реки - 3 км/ч. Определите

Answer 1

12-3=9
ОТвет скорость катера против течения равна 9км/ч

Answer 2

Calculation of the Boat's Speed in Still Water

To determine the boat's speed in still water, we need to consider the effect of the river's current on the boat's overall speed.

Given: - Speed of the boat in still water: 12 km/h - Speed of the river's current: 3 km/h

To calculate the boat's speed in still water, we can use the formula:

Boat's Speed in Still Water = (Boat's Speed in Upstream + Boat's Speed in Downstream) / 2

The boat's speed in upstream is calculated by subtracting the speed of the river's current from the boat's speed in still water:

Boat's Speed in Upstream = Boat's Speed in Still Water - Speed of the River's Current

Similarly, the boat's speed in downstream is calculated by adding the speed of the river's current to the boat's speed in still water:

Boat's Speed in Downstream = Boat's Speed in Still Water + Speed of the River's Current

Let's calculate the boat's speed in still water using these formulas:

Boat's Speed in Upstream = 12 km/h - 3 km/h = 9 km/hBoat's Speed in Downstream = 12 km/h + 3 km/h = 15 km/h Now, we can calculate the boat's speed in still water by taking the average of the boat's speed in upstream and downstream:

Boat's Speed in Still Water = (Boat's Speed in Upstream + Boat's Speed in Downstream) / 2

Boat's Speed in Still Water = (9 km/h + 15 km/h) / 2 = 12 km/h Therefore, the boat's speed in still water is 12 km/h.

Please note that the calculations are based on the given information and assumptions about the boat's speed relative to the river's current.