A water tap fills a tub in 'p' hours and a sink at the bottom empties it in 'q' hours. If p < q and both tap and sink are open, the tank is filled in 'r' hours; then
It is given, A water tap fills a tub in 'p' hours and a sink at the bottom empties it in 'q' hours. Total time to fill the tank will be 1/P – 1/q So, the answer would be option b) 1/r = 1/P – 1/q
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