Question
Pipe 'Q' can fill a tank in 20 hours, while Pipe 'R'
completes the job in 15 hours. If both pipes are operated simultaneously, how long will it take for them to fill the tank?Solution
Total capacity of tank = 60 {LCM of 20 and 15} Efficiency of pipe 'Q' = 60/20 = 3 units per hr Efficiency of pipe 'R' =Â 60/15 = 4 units per hr Required time = 60/7 = 8(4/7) hrs Hence, option c.
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