Pipe P alone fills a swimming pool in 20 hours and pipe Q alone fills it in 80 hours. How long will the two pipes take to fill the empty pool together (in hours)?

Question

Accepted Answer

16. Together they fill 1/20 + 1/80 = (4 + 1)/80 = 1/16 of the pool per hour, so the pool fills in 16 hours.

Pipe P alone fills a swimming pool in 20 hours and pipe Q alone fills it in 80 hours. How long will the two pipes take to fill the empty pool together (in hours)?

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