document.write( "Question 1140427: 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( "
Algebra.Com's Answer #760954 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "The filling rate for \"both\" faucets filling the tub at the same time is the \"sum+\"of their rates.
\n" ); document.write( "The unit should be \"tub\" per \"minute\".
\n" ); document.write( "You will then want th\"e+reciprocal+\"of the result to have \"minute\" per \"tub\".\r
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\n" ); document.write( "\n" ); document.write( "\"1%2F13%2B1%2F7=1%2Ft+\"\r
\n" ); document.write( "\n" ); document.write( "\"%287%2B13%29%2F%2813%2A7%29=1%2Ft\" \r
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\n" ); document.write( "\n" ); document.write( "\"20%2F91=1%2Ft+\"\r
\n" ); document.write( "\n" ); document.write( "\"20t=91\" \r
\n" ); document.write( "\n" ); document.write( "\"t=91%2F20\"\r
\n" ); document.write( "\n" ); document.write( " \"t=4.55\" minutes<---- your answer\r
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