Question
Tap A and Tap B fill a drum of volume 189 liters in 7 minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 18.9 minutes. Find x-y.
Solution
                    A+B         B Time         7     :   18.9 Efficiency        18.9   :    7                          27  :    10 Efficiency of A+B = 27 Efficiency of B = 10 Efficiency of A = 27 – 10 = 17 Ratio = x:y = 17:10 So, x – y = 17 – 10 = 7
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