document.write( "Question 85282: A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes \n" ); document.write( "
Algebra.Com's Answer #61474 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
A tank can be emptied thru either of 2 pipes, the 1st pipe empties the tank in 4hours. The 2nd pipe empties in 3hours. how long will it take to emptythe tank using both pipes
\n" ); document.write( "-----------------------
\n" ); document.write( "1st Pipe DATA:
\n" ); document.write( "Time = 4 hours/job ; Rate = 1/4 job/hr
\n" ); document.write( "--------------
\n" ); document.write( "2nd Pipe DATA:
\n" ); document.write( "Time = 3 hours/job ; Rate = 1/3 job/hr
\n" ); document.write( "--------------
\n" ); document.write( "Together DATA;
\n" ); document.write( "Time = x hours/job ; Rate = 1/x job/hr
\n" ); document.write( "----------------
\n" ); document.write( "EQUATION:
\n" ); document.write( "rate + rate = together rate
\n" ); document.write( "1/4 + 1/3 =1/x
\n" ); document.write( "7/12 = 1/x
\n" ); document.write( "x= 12/7 = 1 hr (5/7)*60 minutes
\n" ); document.write( "x = 1 hr 42.86 minutes ( Time to empty the tank if both pipes are open)
\n" ); document.write( "===============
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
\n" );