Question
Tap A and Tap B fill a drum of volume 408 liters in 12 minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 40.8 minutes. Find x-y.
Solution
                    A+B         B Time         12   :  40.8 Efficiency    40.8  :    12                          34  :    10 Efficiency of A+B = 34 Efficiency of B = 10 Efficiency of A = 34 – 10 = 24 Ratio = x:y = 24:10 So, x – y = 24 – 10 = 14
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