Two pipes P and Q can fill a tank in 22.5 hours and 18 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank ?
Solution: Part filled by P in 1 hour = 1/18; part filled by Q in 1 hour = 1/22.5 = 2/45.
Part filled by (P+Q) in 1 hour = (1/18 + 2/45) = 9/90 = 1/10.
Hence, both the pipes together will fill the tank in 10 hours.
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