document.write( "Question 377560: A pipe can fill a swimming pool in 10 hours. If a second pipe is opened, the two pipes together can fill the pool in 4 hours. How long would it take the second pipe alone to fill the pool? -Thanks a lot! \n" ); document.write( "
Algebra.Com's Answer #268271 by edjones(8007)\"\" \"About 
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Let x = number of hour it take the 2nd pipe alone to fill the pool.
\n" ); document.write( "1/10 + 1/x = 1/4
\n" ); document.write( "2x+20=5x Multiply each side by 20x
\n" ); document.write( "3x=20
\n" ); document.write( "x=20/3 hrs.
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