Question

Моторная лодка 2 часа плыла по течению реки и 3 часа против течения. Собственная скорость моторной лодки 19,5 км/ч, скорость течения реки 2,8 км/ч. Какое расстояние проплыла моторная лодка???

Answer 1

1) 19,5 + 2.8 = 22,3 км/ч - скорость по течению
2) 19,5 - 2,8 = 16,7 км/ч - скорость против течения
3) 22,3*2 = 44,6 км -  по течению
4) 16,7*3 = 50,1 км - против течения
5) 44,6 + 50,1 = 94,7 км - весь путь
Ответ: 94,7 км

Answer 2

Calculation of the Distance Traveled by the Motorboat

To calculate the distance traveled by the motorboat, we need to consider the time spent traveling with the current and against the current, as well as the speed of the motorboat and the speed of the river current.

Given information: - Time spent traveling with the current: 2 hours - Time spent traveling against the current: 3 hours - Speed of the motorboat: 19.5 km/h - Speed of the river current: 2.8 km/h

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

Using this formula, the distance traveled with the current can be calculated as follows: Distance with current = Speed with current x Time with current

Substituting the given values: Distance with current = 19.5 km/h x 2 hours

To calculate the distance traveled against the current, we can use the same formula: Distance against current = Speed against current x Time against current

Substituting the given values: Distance against current = 19.5 km/h x 3 hours

To find the total distance traveled by the motorboat, we can add the distances traveled with and against the current: Total distance = Distance with current + Distance against current

Let's calculate the distances:

Distance with current = 19.5 km/h x 2 hours = 39 km Distance against current = 19.5 km/h x 3 hours = 58.5 km

Total distance = 39 km + 58.5 km = 97.5 km

Therefore, the motorboat traveled a distance of 97.5 km.