document.write( "Question 942708: one pipe can fill a tank in 3 hours, the second can fill a tank in 4 hours and the third can fill a tank in 6 hours. How long will it take to fill the tank with all three pipes operating?
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Algebra.Com's Answer #574708 by TimothyLamb(4379)\"\" \"About 
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rate:
\n" ); document.write( "r = w/t
\n" ); document.write( "rates are additive:
\n" ); document.write( "r = 1/3 + 1/4 + 1/6
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\n" ); document.write( "time:
\n" ); document.write( "t = w/r
\n" ); document.write( "t = 1/(1/3 + 1/4 + 1/6)
\n" ); document.write( "t = 1.33333333333 hours
\n" ); document.write( "t = 1 1/3 hours
\n" ); document.write( "t = 1 hour and (1/3 hour * 60 minutes/hour)
\n" ); document.write( "t = 1 hour and 20 minutes
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