Question

один насос может выкачать всю воду из катлована за 36 ч а другой в 2 раза быстрее .после того как они работая вместе выкачали 1/3 всей воды , второй насос сломался , и остальную воду выкачал оди н первый насос .за сколько времени была выкачана вся вода из этого котлована?

Answer 1

36/2=18 ч-время второго

1-объем котлована 
1/36- производительность 1го
1/18-производительность 2го
1/36+1/18=1/36+2/36=3/36=1/12-совместная производительность

1/3:1/12=1/3*12/1=12/3=4ч работали вместе

1-1/3=2/3-такую часть котлована выкачивал только первый насос
2/3:1/36=2/3*36/1=2* 12=24ч

4+24=28ч -за столько времени была выкачана вся вода из этого котлована

Answer 2

Problem Analysis

We are given two pumps, one of which can pump all the water out of a pit in 36 hours, while the other pump is twice as fast. After working together and pumping out 1/3 of the water, the second pump breaks down, and the remaining water is pumped out by the first pump alone. We need to determine how long it takes to pump out all the water from the pit.

Solution

Let's assume that the first pump can pump out 1 unit of water per hour. Therefore, the first pump can pump out the entire pit in 36 hours. Since the second pump is twice as fast, it can pump out 2 units of water per hour.

After working together and pumping out 1/3 of the water, the remaining 2/3 of the water needs to be pumped out by the first pump alone. Let's denote the total amount of water in the pit as W.

The first pump can pump out 1/3 of the water in 36 hours. Therefore, it can pump out (1/3)W in 36 hours. This means that the remaining (2/3)W of water needs to be pumped out by the first pump alone.

Since the first pump can pump out 1 unit of water per hour, it will take (2/3)W hours to pump out (2/3)W of water.

Therefore, the total time it takes to pump out all the water from the pit is 36 hours (for the first 1/3 of the water) plus (2/3)W hours (for the remaining 2/3 of the water).

Calculation

To calculate the total time, we need to know the value of W, which represents the total amount of water in the pit. Unfortunately, the problem statement does not provide this information. Therefore, we cannot determine the exact time it takes to pump out all the water without knowing the value of W.

If you have any additional information or if there is a specific value of W provided, please let me know, and I will be happy to help you further.