Question

Решите!плиз! Собственная скорость лодки 8,5км/ч,а скорость течения реки 3,5км/ч.Расстояние между пристанями 15км.Сколько времени нужно затратить на путь между пристанями туда и обратно?РЕШИТЕ ПЛИЗ!

Answer 1

Скорость туда 12км/ч
обратно 5 км/ч
15/12+15/5=4.25км между пристанями

Answer 2

1. 8,5 + 1,3 = 9,8 км\ч - скорость лодки по течению 2. 8,5 - 1,3 = 7,2 км\ч - скорость лодки против течения 3. 9,8*3,5 = 34,3 км - пройдет лодка по течению за 3,5 часа 4. 7,2*5,6 = 40,32 км - пройдет лодка против течения за 5,6 часов

Answer 3

Calculation of Time Required for Round Trip

To calculate the time required for a round trip between the two docks, we need to consider the speed of the boat and the speed of the river current.

Given: - Boat speed: 8.5 km/h - River current speed: 3.5 km/h - Distance between the docks: 15 km

To find the time required for the boat to travel from one dock to the other and back, we can use the formula:

Time = Distance / Speed

Let's calculate the time required for the boat to travel from one dock to the other:

Time (one way) = Distance / (Boat Speed + River Current Speed)

Substituting the given values:

Time (one way) = 15 km / (8.5 km/h + 3.5 km/h)

Simplifying the equation:

Time (one way) = 15 km / 12 km/h

Calculating the time (one way):

Time (one way) = 1.25 hours

Since we need to calculate the round trip time, we multiply the one-way time by 2:

Round Trip Time = 1.25 hours * 2

Calculating the round trip time:

Round Trip Time = 2.5 hours

Therefore, it would take approximately 2.5 hours to complete the round trip between the two docks, considering the boat speed of 8.5 km/h and the river current speed of 3.5 km/h.