Question

собственная скорость катера-13 км/ч , скорость течения реки-равна 3 км/ч расстояние между двумя причалами 80 км за какое время пройдёт катер это расстояние если будет плыть по течению реки ? против течения реки ?

Answer 1

1) 80:(13+3)= 5(ч) по течению.

2) 80:(13-3)= 8(ч) - против течения.

Ответ: 5 ч, 8 ч.

Answer 2

По течению реки: 13км/ч+3км/ч=16км/ч => 5 часов

Против течения реки: 13км/ч-3км/ч=10км/ч => 8 часов

Answer 3

Calculation of Time Taken by the Boat

To calculate the time taken by the boat to travel a distance of 80 km, we need to consider the boat's speed and the speed of the river current.

Given: - Boat's speed: 13 km/h - River current speed: 3 km/h - Distance between the two docks: 80 km

When the boat is traveling with the current of the river:

When the boat is traveling with the current of the river, the effective speed of the boat will be the sum of its own speed and the speed of the river current.

Effective speed = Boat's speed + River current speed = 13 km/h + 3 km/h = 16 km/h

To calculate the time taken, we can use the formula:

Time = Distance / Speed

Time = 80 km / 16 km/h = 5 hours

Therefore, if the boat is traveling with the current of the river, it will take approximately 5 hours to cover a distance of 80 km.

When the boat is traveling against the current of the river:

When the boat is traveling against the current of the river, the effective speed of the boat will be the difference between its own speed and the speed of the river current.

Effective speed = Boat's speed - River current speed = 13 km/h - 3 km/h = 10 km/h

To calculate the time taken, we can use the same formula:

Time = Distance / Speed

Time = 80 km / 10 km/h = 8 hours

Therefore, if the boat is traveling against the current of the river, it will take approximately 8 hours to cover a distance of 80 km.

Please note that these calculations assume a constant speed throughout the journey and do not take into account other factors such as changes in the river current or any stops made by the boat along the way.