document.write( "Question 874770: A boat travels 90 miles upstream at a rate of (v-3). It takes the boat 30 minutes longer to travel upstream than it does for the boat to travel downstream at a rate of (v+3). How long does it take the boat to travel downstream? \n" ); document.write( "
Algebra.Com's Answer #527800 by josgarithmetic(39800)\"\" \"About 
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______________speed___________time_________distance
\n" ); document.write( "up____________v-3_____________t+1/2________\"90=%28v-3%29%28t%2B1%2F2%29\"
\n" ); document.write( "down__________v+3_____________t____________\"90=%28v%2B3%29t\"\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "two unknown variables, v and t.
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