document.write( "Question 257730: Can you walk me through this probably simple word problem: If I had the total gallons then I could determine this easier, so I am stumped:
\n" ); document.write( "\" The swimming pool can be filled in 12 hours with a pipe or 30 hours using a hose. How long will it take if both are used?\"\r
\n" ); document.write( "\n" ); document.write( "I want to say 21 hours but that would be too easy?? \n" ); document.write( "
Algebra.Com's Answer #189594 by richwmiller(17219)\"\" \"About 
You can put this solution on YOUR website!
This is a typical work problem.
\n" ); document.write( "We have to find out how much work is done in one hour then add them
\n" ); document.write( "The two together has to be less than the faster alone but the slower doesn't contribute much.
\n" ); document.write( "In one hour the pipe can do 1/12 of the job.
\n" ); document.write( "The hose can do 1/30 of the job in an hour
\n" ); document.write( "j/12+j/30=1
\n" ); document.write( "lcd 60\r
\n" ); document.write( "\n" ); document.write( "5j/60+2j/60=7j/60
\n" ); document.write( "7j=60
\n" ); document.write( "j=60/7
\n" ); document.write( "j=8.57143 hours
\n" ); document.write( "about 8 hrs 34 minutes 17 seconds so the slower contributed 2.5 hours savings\r
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