Question

Выручите пожалуйста! Расстояние между двумя причалами 90 км.Собственная скорость катера 14 км/ч,скорость течения реки 4 км/ч.За какое время катер преодолеет это расстояние,если будет плыть 1)по течению реки 2)против течения реки?

Answer 1

1)14+4=18 км/ч(по течению)
90:18=5ч
2)14-4=10 км/ч (против течения)
90:10=9ч

Answer 2

1 По течению реки
1)14+4=18(км\ч)-скорость 
2)90:18=5(ч)-время

2 против течения
1)14-4=10(км\ч)-скорость
2)90:10=9(ч)-время

Answer 3

Calculation of Time to Travel 90 km

To calculate the time it takes for the boat to travel a distance of 90 km under different conditions, we need to consider the boat's speed and the speed of the river's current.

Given: - Distance between the two docks: 90 km - Boat's speed: 14 km/h - River's current speed: 4 km/h

Traveling with the Current

When the boat is traveling with the current, the effective speed of the boat is the sum of its own speed and the speed of the current. In this case, the boat's effective speed is 14 km/h + 4 km/h = 18 km/h.

To calculate the time it takes for the boat to travel 90 km with the current, we can use the formula:

Time = Distance / Speed

Substituting the values: Time = 90 km / 18 km/h = 5 hours

Therefore, it will take the boat 5 hours to travel 90 km when traveling with the current.

Traveling against the Current

When the boat is traveling against the current, the effective speed of the boat is the difference between its own speed and the speed of the current. In this case, the boat's effective speed is 14 km/h - 4 km/h = 10 km/h.

To calculate the time it takes for the boat to travel 90 km against the current, we can again use the formula:

Time = Distance / Speed

Substituting the values: Time = 90 km / 10 km/h = 9 hours

Therefore, it will take the boat 9 hours to travel 90 km when traveling against the current.

In summary: - When traveling with the current, it will take the boat 5 hours to travel 90 km. - When traveling against the current, it will take the boat 9 hours to travel 90 km.

Please let me know if there's anything else I can help you with!