Question

Холодный кран наполняет ванну за 20 минут. Холодный и горячий вместе - за 15 минут. Сколько минут потребуется что бы наполнить ванну горячей водой? Во всех случаях краны открыты полностью.

Answer 1

1) составим уравнение
Пусть х- время наполнения ванны горячей водой, тогда
1/х+1/20=1/15
1/х=1/15-1/20
1/х=1/60
х=60 мин
Ответ: 60 мин

Answer 2

Вся ванна=1

холодный кран в минуту наполняет 1/20 ванны
холодный и горячий 1/15 ванны

значит горячий наполняет в минуту 1/15 - 1/20= 4/60-3/60=1/60 ванны

1 : 1/60=60 минут.

Answer 3

Calculation of Time to Fill the Bathtub with Hot Water

To calculate the time required to fill the bathtub with hot water, we can use the information provided about the time it takes to fill the bathtub with cold water and the time it takes to fill it with both hot and cold water.

Let's assume that the time it takes to fill the bathtub with cold water alone is 20 minutes, and the time it takes to fill it with both hot and cold water is 15 minutes.

To find the time required to fill the bathtub with hot water, we can subtract the time it takes to fill it with cold water alone from the time it takes to fill it with both hot and cold water.

Time to fill the bathtub with hot water = Time to fill the bathtub with both hot and cold water - Time to fill the bathtub with cold water alone

Substituting the given values:

Time to fill the bathtub with hot water = 15 minutes - 20 minutes

Since the result is negative, it means that it is not possible to fill the bathtub with hot water alone in this scenario.

Please note that the given information does not provide enough data to accurately calculate the time required to fill the bathtub with hot water. Additional information is needed, such as the flow rates of the hot and cold water, the volume of the bathtub, and the temperature of the hot water source.

If you have any additional information or specific requirements, please let me know, and I'll be happy to assist you further.