Question

Собственая скорость теплохода равна 27 км/ч,скорость течения реки 3 км/ ч сколько времени затратит теплоход на путь между двумя пристанями расстояние между которыми 120 км если он будет плыть a)по течению реки , b)против течения реки ?

Answer 1

А) 120:(27+3)=120:30=4 часа
б) 120:(27-3)=120:24=5 часов

Answer 2

Calculation of Time Taken by the Boat

To calculate the time taken by the boat to travel between two ports, we need to consider the boat's speed and the speed of the river's current.

Given: - Boat's speed: 27 km/h - River's current speed: 3 km/h - Distance between the two ports: 120 km

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

Time = Distance / Speed

a) 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's current. Therefore, the effective speed will be 27 km/h + 3 km/h = 30 km/h.

Using the formula, we can calculate the time taken: Time = 120 km / 30 km/h = 4 hours.

b) 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's current. Therefore, the effective speed will be 27 km/h - 3 km/h = 24 km/h.

Using the formula, we can calculate the time taken: Time = 120 km / 24 km/h = 5 hours.

Therefore, the boat will take 4 hours to travel between the two ports when traveling with the current of the river, and 5 hours when traveling against the current of the river.

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