document.write( "Question 1140426: For a certain bathtub, The hot water faucet can fill the tub in 13 minutes. The Cold-water faucet can fill the tub in 7 minutes. If both faucets are used together, how long will it take to fill the tub? \n" ); document.write( "
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For a certain bathtub, The hot water faucet can fill the tub in 13 minutes. The Cold-water faucet can fill the tub in 7 minutes. If both faucets are used together, how long will it take to fill the tub?
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\n" ); document.write( "The hot fills 1/13 of the tub/minute.
\n" ); document.write( "The cold fills 1/7 per minute.
\n" ); document.write( "Together, they fill 1/13 + 1/7 per minute.
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