Question

Собственная скорость лодки 18 км/ч. Скорость течения реки 2 км/ч. Какое расстояние проплыла лодка, если 2 ч она плыла по течению реки и 4 ч против течения реки?

Answer 1

Ответ:

40+64=104 км - всего проплыла лодка

Пошаговое объяснение:

1) 18+2=20 км/ч - скорость  по течению

2) 18-2=16 км/ч - скорость  против течения

3) 2*20=40 км - проплыла по течению

4) 4*16=64 км - проплыла против течения

5) 40+64=104 км - всего проплыла лодка

Answer 2

Calculating the Distance Traveled by the Boat

The boat's speed is 18 km/h, and the river's current speed is 2 km/h. The boat traveled downstream for 2 hours and upstream for 4 hours. To calculate the distance traveled by the boat, we can use the formula:

Distance = Speed × Time

First, let's calculate the distance traveled downstream: - Speed of the boat relative to the river = Boat's speed + River's speed = 18 km/h + 2 km/h = 20 km/h - Time traveled downstream = 2 hours

Using the formula, the distance traveled downstream is: Distance downstream = 20 km/h × 2 h = 40 km Next, let's calculate the distance traveled upstream: - Speed of the boat relative to the river = Boat's speed - River's speed = 18 km/h - 2 km/h = 16 km/h - Time traveled upstream = 4 hours

Using the formula, the distance traveled upstream is: Distance upstream = 16 km/h × 4 h = 64 km

Total Distance Traveled

To find the total distance traveled by the boat, we can use the concept that the total distance traveled is the sum of the distances traveled downstream and upstream:

Total distance = Distance downstream + Distance upstream Total distance = 40 km + 64 km = 104 km

Therefore, the boat traveled a total distance of 104 kilometers.