document.write( "Question 920101: A pool can be filled by pipe A in 3 hours and by pipe B in 5 hours. When the pool is full, it can be drained by pipe C in 4 hours. If the pool is initially empty and all three pipes are open, write an equation to find how long it takes to fill the pool.
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Algebra.Com's Answer #558281 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A pool can be filled by pipe A in 3 hours and by pipe B in 5 hours.
\n" ); document.write( " When the pool is full, it can be drained by pipe C in 4 hours.
\n" ); document.write( " If the pool is initially empty and all three pipes are open,
\n" ); document.write( " write an equation to find how long it takes to fill the pool.
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\n" ); document.write( "Let t = time required to fill the pool with all valves open
\n" ); document.write( "Let the completed job = 1 (a full pool)
\n" ); document.write( "Fill is +, drain is -
\n" ); document.write( ":
\n" ); document.write( " $\"t%2F3\"$ + $\"t%2F5\"$ - $\"t%2F4\"$ = 1
\n" ); document.write( "multiply equation by 60 to cancel the denominators, find t
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