Question
Pipe 'A' fills half tank in 14 minutes. Pipe 'B' is 4
times as efficient. What % of the tank will be filled by both in 4 minutes?Solution
Full tank time = 14 × 2 = 28 minutes Efficiency of pipe 'A' = x units/min Tank capacity = 28x units B’s efficiency = 4x units/min Work in 4 minutes = (x + 4x) × 4 = 20x units Percentage = (20x / 28x) × 100 = 71.43%
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