Question
Pipe 'A' alone takes 15 minutes to fill half of the
tank. Pipe 'B' is 4 times as efficient as pipe 'A'. Find the percentage of the tank filled by both in 5 minutes.Solution
Full tank time = 15 × 2 = 30 minutes A’s efficiency = x units/min Tank capacity = 30x units B’s efficiency = 4x units/min Work in 5 minutes = (x + 4x) × 5 = 25x units Percentage filled = (25x / 30x) × 100 = 83.33%
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