document.write( "Question 48835: Debbie traveled by boat 5 miles upstream to fish in her favorite spot. Because of the 4 mile per hour current, it took her 40 minutes longer to get there than to return. How fast will her boat go in still water? (Please round answer to one decimal place.) \n" ); document.write( "

Algebra.Com's Answer #32345 by Paul(988) $\"\"$ $\"About$

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LEt x represent the speed of the boat
\n" ); document.write( "EQUATION:
\n" ); document.write( " $\"5%2F%28x-4%29-5%2F%28x%2B4%29=2%2F3\"$
\n" ); document.write( " $\"5%28%28x%2B4%29-%28x-4%29%29=%282%28%28x%2B4%29%28x-4%29%29%29%2F3\"$
\n" ); document.write( " $\"5%288%29=%282%28x%5E2-16%29%29%2F3\"$
\n" ); document.write( " $\"40=%282x%5E2-32%29%2F3\"$
\n" ); document.write( " $\"120=2x%5E2-32\"$
\n" ); document.write( "x=8.7
\n" ); document.write( "Hence, the speed of the boat is 8.7mph
\n" ); document.write( "Paul. \n" ); document.write( "

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