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One pipe can fill a cistern in 1 1/2 hours while a second pipe can fill it in 2 1/3 hrs. Three pipes working together fill the cistern in 42 minutes. How long would it take the third pipe alone to fill the tank?

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sorry i dont know are you in conexxus er what

1/90 + 1/140 + 1/x = 1/42

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