three pipes a,b and c can fill a tank form empty to full in 30 min,20 min ,10 min respectively .When the tank is empty ,all the three pipes are opened a b and c discharged chemical solutions p,q,r respectively .What fraction of the solution R in the liquid in the tank after 3 days 

\It will be 3 minutes not 3 days at the end of the question, so correcting the same here is the answer, 

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10                                                                                                                                                                                                                                                                                            60
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