Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes ?
Part filled by (A + B + C) in 3 minutes = 3(1/30+1/20+1/10)
Part filled by C in 3 minutes = 3/10.
Required ratio = (3/10×20/11)
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