Question
Two pipes, X and Y, can individually fill a tank in 50
minutes and 25 minutes respectively. If both pipes are opened simultaneously, after how much time should pipe X be closed so that the remaining part of the tank is filled in 10 minutes by pipe Y alone?Solution
ATQ, Both pipes are opened simultaneously. Let 'w' be the minutes after which pipe X is closed 
Pipe X should be closed after 10 minutes.
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