Tap A and Tap B fill a drum of volume 648 liters in 12 minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 64.8 minutes. Find x-y.
                    A+B         B Time                12     :   64.8 Efficiency        64.8   :    12                          54    :    10 Efficiency of A+B = 54 Efficiency of B = 10 Efficiency of A = 54 – 10 = 44 Ratio = x:y = 44:10 So, x – y = 44 – 10 = 34
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