Question
Pipe 'A' alone takes 12 minutes to fill half the tank.
Pipe 'B' is twice as efficient. What percentage of the tank is filled by both in 6 minutes?Solution
Full tank time = 12 × 2 = 24 minutes Efficiency of pipe 'A' = x units/min Tank capacity = 24x units B’s efficiency = 2x units/min Work in 6 minutes = (x + 2x) × 6 = 18x units Percentage = (18x / 24x) × 100 = 75%
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