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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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
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