Question

Пароход проплыл по течению реки 186км,а против 125км. сколько времени потребовалось пароходу на вемь путь, если его собственная скорость 28км/ч,а скорость реки 3км/ч.

Answer 1

186/(28+3)=186/31=6ч- по течению
125/(28-3)=125/25=5ч-против течения
6+5=11ч всего

Answer 2

Calculation of Time Required for the Journey

To calculate the time required for the journey, we need to consider the distance traveled with the current and against the current separately.

The distance traveled with the current is given as 186 km, and the distance traveled against the current is given as 125 km.

Let's calculate the time required for each leg of the journey.

Time required for the journey with the current:

The speed of the ship is given as 28 km/h, and the speed of the river current is given as 3 km/h. When traveling with the current, the effective speed of the ship is the sum of its own speed and the speed of the current.

Therefore, the effective speed of the ship when traveling with the current is 28 km/h + 3 km/h = 31 km/h.

To calculate the time required for the journey with the current, we divide the distance traveled with the current by the effective speed of the ship:

Time = Distance / Speed

Time = 186 km / 31 km/h = 6 hours

Time required for the journey against the current:

When traveling against the current, the effective speed of the ship is the difference between its own speed and the speed of the current.

Therefore, the effective speed of the ship when traveling against the current is 28 km/h - 3 km/h = 25 km/h.

To calculate the time required for the journey against the current, we divide the distance traveled against the current by the effective speed of the ship:

Time = Distance / Speed

Time = 125 km / 25 km/h = 5 hours

Total Time Required for the Journey

To calculate the total time required for the journey, we add the time required for the journey with the current and the time required for the journey against the current:

Total Time = Time with the current + Time against the current

Total Time = 6 hours + 5 hours = 11 hours

Therefore, it took the ship a total of 11 hours to complete the journey.