Question

Собственная скорост теплохода 30к/ч скорость течения реки 4 1/2 км/чза какоп время теплоход преодолеет 23 км ч по течению реки

Answer 1

1) 30 + 4,5 = 34,5(км/ч) скорость теплохода по течению реки.
2) 23 : 34,5 ≈ 0,67(часа)
   0,67ч ≈ 40(минут)
Ответ: ≈ за 40минут теплоход пройдёт 23 км

Answer 2

Calculation of Time to Overcome 23 km Against River Current

To calculate the time it takes for the boat to overcome a distance of 23 km against the river current, we can use the formula:

Time = Distance / (Boat's speed - River's speed)

Given: - Boat's speed = 30 km/h- River's speed = 4 1/2 km/h- Distance to overcome = 23 km

Calculation

Using the given values in the formula: Time = 23 / (30 - 4 1/2)

Solution

Time = 23 / (30 - 4.5) Time = 23 / 25.5 Time ≈ 0.902 hours

So, the time it takes for the boat to overcome 23 km against the river current is approximately 0.902 hours.