Question

ДРОБЯМИРасстояние между причалами 27 км. Сколько времени затратит моторная лодка на путь от одного причала до другого и обратно, если собственная скорость лодки 12 км/ч, а скорость против течения реки 3 км/ч?

Answer 1

1) 12 - 3 = 9(км/час) скорость течения реки
2) 12 + 9 = 21(км/час) скорость по течению
3) 27/21 + 27/3 = 216/21 = 10 2/7 (часа) затратит моторная лодка на путь от одного причала до другого и обратно

Answer 2

Calculation of Time Taken by Motorboat

To calculate the time taken by the motorboat to travel from one pier to another and back, we need to consider the distance between the piers, the speed of the motorboat, and the speed of the current.

Given: - Distance between the piers: 27 km - Speed of the motorboat: 12 km/h - Speed of the current: 3 km/h

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

Time = Distance / Speed

Let's calculate the time taken by the motorboat to travel from one pier to another and back.

1. Time taken to travel from one pier to another: - Distance: 27 km - Speed: 12 km/h - Time = 27 km / 12 km/h

2. Time taken to travel back from the second pier to the first pier: - Distance: 27 km - Speed: 12 km/h (since the speed of the motorboat remains the same) - Time = 27 km / 12 km/h

3. Total time taken: - Total time = Time taken to travel from one pier to another + Time taken to travel back from the second pier to the first pier

Let's calculate the time taken step by step:

1. Time taken to travel from one pier to another: - Time = 27 km / 12 km/h = 2.25 hours

2. Time taken to travel back from the second pier to the first pier: - Time = 27 km / 12 km/h = 2.25 hours

3. Total time taken: - Total time = 2.25 hours + 2.25 hours = 4.5 hours

Therefore, the motorboat will take approximately 4.5 hours to travel from one pier to another and back, considering its own speed of 12 km/h and the speed of the current as 3 km/h.