Question

10 pipes through which water flows at a constant rate can fill a tank in 28 minutes. If 3 pipes go out of order, how long will the remaining pipes take to fill the tank?
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Answer 1

Answer:

10 Pipes can fill the tank in 28min

∴ 1 pipe can fill the tank in 10×28min

∴ 7 pipe can fill the tank in 10×28/7min

= 40 min

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