SOLUTION: One pipe can fill a tank in 50 minutes and a second pipe can fill it in 90 minutes. When the tank was empty, the first pipe was opened for 20 minutes, then shut. How long will it t
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Question 1025931: One pipe can fill a tank in 50 minutes and a second pipe can fill it in 90 minutes. When the tank was empty, the first pipe was opened for 20 minutes, then shut. How long will it take the second pipe to finish the job? Answer by josgarithmetic(39620) (Show Source):
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