Question

Об’єм басейна 840 л. До нього підведено дві труби. Через одну трубу в басейн за 1 хв поступає 5 л води, а через другу – 7 л води. За який час наповниться басейн, якщо відкрити обидві труби?

Answer 1

5 л+7 л=12 л воды в минуту поступает из двух труб вместе
840 л:12 л/мин=70 мин (или 1 час 10 мин)
Ответ: бассейн наполнится за 1 час 10 минут, если открыты обе трубы

Answer 2

1) 5+7 = 12 (л)
2) 840 ÷ 12 = 70 (хв.)
70 хв. = 1 ч. 10 хв.

Answer 3

Calculation of the Time to Fill the Pool

To calculate the time it takes to fill the pool, we need to determine the combined rate at which water flows through both pipes.

According to the information provided, one pipe delivers 5 liters of water per minute, while the other pipe delivers 7 liters of water per minute.

To find the combined rate, we add the flow rates of both pipes:

Combined flow rate = 5 liters/minute + 7 liters/minute = 12 liters/minute.

Now, we can calculate the time it takes to fill the pool by dividing the pool's volume by the combined flow rate:

Time to fill the pool = Pool volume / Combined flow rate.

Given that the pool volume is 840 liters and the combined flow rate is 12 liters/minute, we can substitute these values into the equation:

Time to fill the pool = 840 liters / 12 liters/minute.

To simplify the calculation, we can convert liters/minute to liters/second by dividing by 60:

Time to fill the pool = 840 liters / (12 liters/minute * (1 minute/60 seconds)).

Simplifying further:

Time to fill the pool = 840 liters / (12/60) liters/second.

Time to fill the pool = 840 liters / (12/60) liters/second = 840 liters / (0.2 liters/second).

Finally, we can calculate the time it takes to fill the pool:

Time to fill the pool = 840 liters / 0.2 liters/second = 4200 seconds.

Therefore, it will take 4200 seconds to fill the pool if both pipes are opened.