Question

Теплоход шел 2 ч. против реки и 3 ч. по течению.Какой путь проделал теплоход за это время,если скорость течения составляет 3 км/ч,а собственная скорость теплохода 45 км/ч? ПОМОГИТЕ ПЖ !!??

Answer 1

45+3=48 км/ч (соб.+ скорость течения)
48×2=96 км (по течению)
45-3=42 км/ч (соб.+против течения)
42×3=126 км (против течения)
126+96=222 км (всего)
Ответ. Теплоход проделал путь в 222 км.

Answer 2

Calculation of the Distance Traveled by the Boat

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

Given: - Time spent traveling against the river: 2 hours - Time spent traveling with the river's current: 3 hours - Speed of the river's current: 3 km/h - Speed of the boat: 45 km/h

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

Distance = Speed x Time

For the time spent traveling against the river, the boat's effective speed will be the difference between its speed and the speed of the river's current. So the effective speed will be:

Effective speed against the river = Boat speed - River current speed

Substituting the given values:

Effective speed against the river = 45 km/h - 3 km/h = 42 km/h

Using the formula for distance, we can calculate the distance traveled against the river:

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

Substituting the given values:

Distance against the river = 42 km/h x 2 hours = 84 km

To calculate the distance traveled with the river's current, the effective speed will be the sum of the boat's speed and the speed of the river's current. So the effective speed will be:

Effective speed with the river's current = Boat speed + River current speed

Substituting the given values:

Effective speed with the river's current = 45 km/h + 3 km/h = 48 km/h

Using the formula for distance, we can calculate the distance traveled with the river's current:

Distance with the river's current = Effective speed with the river's current x Time with the river's current

Substituting the given values:

Distance with the river's current = 48 km/h x 3 hours = 144 km

Therefore, the boat traveled a total distance of 84 km against the river and 144 km with the river's current during the given time.