NPR's Ayesha Rascoe plays the puzzle with Jeff Forster of Pittsburgh, Pennsylvania and puzzlemaster Will Shortz. Sunday Puzzle: Fill in the Blank On-air challenge: I'm going to read you some sentences ...
Three water pumps, A, B and C, can be used to fill a pool. Pump A can fill the pool in two hours, pump B takes three hours, and pump C takes six hours. How long does it take for the pool to fill if ...
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