document.write( "Question 196804: if it takes pipe A 20 days to fill a fish pond and pipe B 15 days to fill the same pond how long will it take both pipes together to fill the same fish pond \n" ); document.write( "

Algebra.Com's Answer #147526 by Anthea Lawn(22) $\"\"$ $\"About$

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In one day, pipe A will have filled a twentieth of the pond.\r
\n" ); document.write( "\n" ); document.write( "In one day, pipe B will have filled a fifteenth of the pond.\r
\n" ); document.write( "\n" ); document.write( "So with both pipes running, in one day, $\"1%2F20\"$ + $\"1%2F15\"$ of the pond will be filled.\r
\n" ); document.write( "\n" ); document.write( "To add these together, express them as fractions of 60 (since both 20 and 15 go into 60)\r
\n" ); document.write( "\n" ); document.write( "After one day $\"3%2F60\"$ + $\"4%2F60\"$ = $\"7%2F60\"$ of the pond is filled.\r
\n" ); document.write( "\n" ); document.write( "So the pond is full after $\"60%2F7\"$ days\r
\n" ); document.write( "\n" ); document.write( "(approx 8 days, 13 hours, 42 minutes) \n" ); document.write( "

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