Question

Лодка шла по течению 0,9часов и против 0,1ч.Собственная скорость лодки 4,2км ч а скорость течения реки 1,2км ч.Какой путь прошла лодка за это время помогите прошу я спать хочу завтра школа учёба всё это хреново мини рэпчага готова

Answer 1

(4,2+1,2)*0,9=5,4*0,9=4,86км прошла лодка по течению
(4,2-1,2)*0,1=3*0,1=0,3км прошла лодка против течения
4,86+0,3=5,16км прошла лодка за всё время

Answer 2

Calculation of the Boat's Distance Traveled

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

Given: - Time spent traveling with the current: 0.9 hours - Time spent traveling against the current: 0.1 hours - Boat's speed: 4.2 km/h - Speed of the river's current: 1.2 km/h

To calculate the distance traveled with the current, we can use the formula:

Distance = Speed × Time

For the time spent traveling with the current, the boat's effective speed will be the sum of its own speed and the speed of the river's current:

Effective speed = Boat's speed + Speed of the river's current

Let's calculate the distance traveled with the current:

Distance with the current = Effective speed × Time with the current

Substituting the given values:

Distance with the current = (Boat's speed + Speed of the river's current) × Time with the current

Distance with the current = (4.2 km/h + 1.2 km/h) × 0.9 hours

Distance with the current = 5.4 km/h × 0.9 hours

Distance with the current = 4.86 km

Now, let's calculate the distance traveled against the current:

Distance against the current = Effective speed × Time against the current

Substituting the given values:

Distance against the current = (Boat's speed - Speed of the river's current) × Time against the current

Distance against the current = (4.2 km/h - 1.2 km/h) × 0.1 hours

Distance against the current = 3 km/h × 0.1 hours

Distance against the current = 0.3 km

To find the total distance traveled by the boat, we can add the distances traveled with and against the current:

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

Total distance = 4.86 km + 0.3 km

Total distance = 5.16 km

Therefore, the boat traveled a total distance of 5.16 kilometers during the given time.