Question

От пристани А до пристани В лодка плыла по течению реки 3,5 ч.На обратный путь она щатратила 5 часов 15 минут.Какое расстояние преодолела лодка за всё время движения,если скорость течения реки 2 км/ч?

Answer 1

(3.5+2)×(5.15-2)=5.5×3.15=17.33 км Ответ: 17.33 (км)

Answer 2

Calculating the Distance Traveled by the Boat

To calculate the distance traveled by the boat, we can use the formula:

distance = speed × time

First, let's calculate the speed of the boat relative to the water for the downstream and upstream journeys.

Downstream Journey:

The boat is traveling with the flow of the river, so the effective speed is the sum of the boat's speed in still water and the speed of the river's current.

The boat's speed in still water = x km/h The speed of the river's current = 2 km/h

So, the speed of the boat during the downstream journey is: x + 2 km/h

The time taken for the downstream journey = 3.5 hours

Using the formula, we can calculate the distance traveled during the downstream journey.

Upstream Journey:

The boat is traveling against the flow of the river, so the effective speed is the difference between the boat's speed in still water and the speed of the river's current.

The speed of the boat during the upstream journey is: x - 2 km/h

The time taken for the upstream journey = 5 hours 15 minutes = 5.25 hours

Using the formula, we can calculate the distance traveled during the upstream journey.

Finally, we can find the total distance traveled by adding the distances covered during the downstream and upstream journeys.

Let's calculate the distances for the downstream and upstream journeys.