Question
Tap A and Tap B fill a drum of volume 475 liters in 19
minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 47.5 minutes. Find x-y.Solution
                    A+B         B Time         19   :  47.5 Efficiency    47.5  :    19                          25  :    10 Efficiency of A+B = 25 Efficiency of B = 10 Efficiency of A = 25 – 10 = 15 Ratio = x:y = 15:10 So, x – y = 15 – 10 = 5
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