Question

Лодка двигалась 0.4 ч против течения и 0.8 ч по течению реки .Сколько км прошла лодка за это время,если её собственная скорость 3,5 км/ч , а скорость течения 1.8км/ч? помогите пожалуйста срочно надо

Answer 1

(3,5+ 1,8)×0,8)+(3,5-1,8)×0,4)=4,24+0,68=4,92 (км)-

Answer 2

Calculation of Distance Traveled by the Boat

To calculate the distance traveled by the boat, we need to consider the time spent traveling against the current and the time spent traveling with the current.

Given: - Time spent traveling against the current: 0.4 hours - Time spent traveling with the current: 0.8 hours - Boat's own speed: 3.5 km/h - Speed of the current: 1.8 km/h

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

Distance = Speed x Time

For the time spent traveling against the current, the effective speed of the boat will be the difference between its own speed and the speed of the current:

Effective speed against the current = Boat's own speed - Speed of the current

Substituting the given values:

Effective speed against the current = 3.5 km/h - 1.8 km/h = 1.7 km/h

Now, we can calculate the distance traveled against the current:

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

Distance against the current = 1.7 km/h x 0.4 hours

Distance against the current = 0.68 km

Similarly, to calculate the distance traveled with the current, we can use the same formula:

Effective speed with the current = Boat's own speed + Speed of the current

Substituting the given values:

Effective speed with the current = 3.5 km/h + 1.8 km/h = 5.3 km/h

Now, we can calculate the distance traveled with the current:

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

Distance with the current = 5.3 km/h x 0.8 hours

Distance with the current = 4.24 km

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

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

Total distance = 0.68 km + 4.24 km

Total distance = 4.92 km

Therefore, the boat traveled a total distance of 4.92 km during the given time, considering its own speed and the speed of the current.