Question

Six pumps working together empty a tank in 28 minutes. How long will it take to empty the tank if 4 such pumps are working together?


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Answer 1

Answer:

Step-by-step explanation:

Time taken by 6 pumps to empty a tank = 28 minutes.

We need to find time taken by 4 such pumps to empty the tank.

Let the time taken by 4 pumps to empty the tank be x

Pumps      Time Taken

6                    28

4                     x

As the number of pumps are decreasing so the time taken will also increase. Therefore, It is an inverse variation.

⇒ 4 × x = 6 × 28

⇒ 4·x = 168

⇒ x = 42

Therefore, Time taken by 4 such pumps to empty the tank = 42 minutes