Question

Собственная скорость теплохода 14 км в час путь от пристани а до пристани б теплоход проходит против течения реки за 20 часов за сколько часов теплоход пройдет обратный путь если скорость течения реки 2 км в час

Answer 1

12×20=240
240:16=15
Ответ 15 часов

Answer 2

Calculation of the Return Journey Time

To calculate the time it will take for the ship to travel back from point B to point A against the current, we need to consider the speed of the ship and the speed of the river current.

Given information: - Speed of the ship: 14 km/h - Time taken to travel from point A to point B against the current: 20 hours - Speed of the river current: 2 km/h

To calculate the time for the return journey, we can use the formula:

Time = Distance / Speed

Let's calculate the distance first. Since the ship traveled from point A to point B in 20 hours, we can find the distance using the formula:

Distance = Speed * Time

Substituting the values: Distance = 14 km/h * 20 hours = 280 km

Now, let's calculate the time for the return journey. The ship will be traveling with the current, so we need to subtract the speed of the river current from the speed of the ship:

Speed of the ship with the current = Speed of the ship - Speed of the river current

Substituting the values: Speed of the ship with the current = 14 km/h - 2 km/h = 12 km/h

Using the formula for time, we can calculate the time for the return journey:

Time = Distance / Speed

Substituting the values: Time = 280 km / 12 km/h ≈ 23.33 hours

Therefore, it will take approximately 23.33 hours for the ship to travel back from point B to point A with a speed of 12 km/h against a river current of 2 km/h.

Please note that the calculated time is an approximation and may vary depending on various factors such as weather conditions and the actual speed of the river current.