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Two pipes P and Q can fill the tank alone in 60 and 90 hours respectively. If they are opened together, then in how many hours will the tank be filled?1). 352). 323). 364). 30 |
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Answer» PART of tank filled by P in 1 hour = 1/60 Part of tank filled by Q in 1 hour = 1/90 ⇒ Part of tank filled by both in 1 hour = 1/60 + 1/90 = (3 + 2)/180 = 5/180 ∴ TIME taken by both to fill the tank = 180/5 = 36 HOURS |
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