document.write( "Question 93298: One pipe alone will fill a tank in 7 1/2 hrs. A second pipe will fill it alone in 10 hrs. I the second pipe were open for 8 hrs. and then closed, how long would the first pipe take to finish filling the tank? \n" ); document.write( "
Algebra.Com's Answer #67915 by stanbon(75887)\"\" \"About 
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One pipe alone will fill a tank in 7 1/2 hrs. A second pipe will fill it alone in 10 hrs. If the second pipe were open for 8 hrs. and then closed, how long would the first pipe take to finish filling the tank?
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\n" ); document.write( "1st pipe DATA:
\n" ); document.write( "Time = 15/2 hr/job ;Rate = 2/15 job/hr
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\n" ); document.write( "2nd pipe DATA:
\n" ); document.write( "Time = 10 hr/job ; Rate = 1/10 job/hr
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\n" ); document.write( "2nd for 8 hrs + 1st for x hrs = 1 job
\n" ); document.write( "8(1/10) + (2/15)x = 1
\n" ); document.write( "Multiply thru by 30 to get:
\n" ); document.write( "24 + 4x = 30
\n" ); document.write( "4x = 6
\n" ); document.write( " x= 3/2 hrs (time the 2nd pipe will take to finish the job)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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