Question
Pipe ‘A’ fills a tank in 25 hours, and pipe ‘B’
empties it in 50 hours. If both are opened together, how much time will it take to fill 80% of the tank?Solution
Let the capacity of the tank be 100 litres.So, efficiency of pipe ‘A’ = 100 ÷ A = 4 litres/hour And efficiency of pipe ‘B’ = 100 ÷ B = 2 litres/hour So, combined efficiency of both pipes = 4 – 2 = 2 litres/hour So, time taken to fill 80% of the tank = (100 × 0.80) ÷ 2 = 80 ÷ 2 = 40 hours
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