Question
Tap A and Tap B fill a drum of volume 357 liters in 17
minutes. If their efficiencies are in the ratio x:y respectively and B alone takes to fill the cistern 35.7 minutes. Find x-y.Solution
                    A+B         B Time         17   :  35.7 Efficiency    35.7  :    17                          21  :    10 Efficiency of A+B = 21 Efficiency of B = 10 Efficiency of A = 21 – 10 = 11 Ratio = x:y = 11:10 So, x – y = 11 – 10 = 1
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