Question
Pipe âAâ can fill a 210-litre tank in 21 hours. If
pipe âAâ is 25% more efficient than pipe âCâ whereas pipe âBâ is 50% more efficient than pipe âCâ, then find the time (in minutes) taken by all the given three pipes to fill the same tank together.Solution
According to Question; Efficiency of pipe âAâ = (210/21) = 10 litres/hour Efficiency of pipe âCâ = 10 á 1.25 = 8 litres/hour Efficiency of pipe âBâ = 8 Ă 1.5 = 12 litres/hour Time taken by all the pipes together to fill the tank = {210/(10 + 8 + 12)} = (210/30) = 7 hours Or, time taken by all three pipes together to fill the tank = 7 Ă 60 = 420 minutes Â
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