Question
Pipe L can fill a pool in 30 hours and pipe M in 45
hours. If both the pipes are opened in an empty pool, how much time will they take to fill it?Solution
Pipe L rate: 1/30 pool per hour Pipe M rate: 1/45 pool per hour Combined rate = 1/30 + 1/45 = 5/90 Time to fill the pool = 90/5 = 18 hours
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