Question

Собственная скорость лодки 0,8 км/ч.Она плыла по течению 0,6 ч и против течения 0,8 ч.Какой путь проплыла лодка за все это время,если скорость течения 2,5 км/ч . Помогите пожалуйста - только начали изучать тему и учитель ничего не рассказала о ней.

Answer 1

8+2,5 = 10,5  км/ч  
10,5*0,6 = 6,3 км 

8 - 2,5 = 5,5 км/ч скорость лодки против течения
5,5*0,8= 4,4 км

6,3+4,4=10,7 км  прошла всего лодка

Answer 2

Calculation of the Boat's Distance Traveled

To calculate the distance traveled by the boat, we need to consider its speed and the time it spent traveling in different directions.

Given information: - Boat's own speed: 0.8 km/h - Time spent traveling with the current: 0.6 hours - Time spent traveling against the current: 0.8 hours - Speed of the current: 2.5 km/h

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

Distance = Speed × Time

Let's calculate the distance traveled by the boat in each direction:

1. Distance traveled with the current: - Speed of the boat relative to the current = Boat's own speed + Speed of the current - Speed of the boat relative to the current = 0.8 km/h + 2.5 km/h = 3.3 km/h - Time spent traveling with the current = 0.6 hours - Distance traveled with the current = Speed × Time = 3.3 km/h × 0.6 hours = 1.98 km

2. Distance traveled against the current: - Speed of the boat relative to the current = Boat's own speed - Speed of the current - Speed of the boat relative to the current = 0.8 km/h - 2.5 km/h = -1.7 km/h (Note: The negative sign indicates that the boat is moving in the opposite direction of the current.) - Time spent traveling against the current = 0.8 hours - Distance traveled against the current = Speed × Time = -1.7 km/h × 0.8 hours = -1.36 km

Now, let's calculate the total distance traveled by the boat:

Total distance = Distance traveled with the current + Distance traveled against the current

Total distance = 1.98 km + (-1.36 km) = 0.62 km

Therefore, the boat traveled a total distance of 0.62 kilometers during the given time, considering its own speed and the speed of the current.

Please note that the negative sign in the distance traveled against the current indicates that the boat moved in the opposite direction of the current.