document.write( "Question 370896: A boat can travel 5 miles downstream in the same length of time it travels 3 miles upstream. If the rate of the current is 3 mph, find the speed of the boat in still water. I need to create an equation for this word problem as well as find the solution. \n" ); document.write( "

Algebra.Com's Answer #264356 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A boat can travel 5 miles downstream in the same length of time it travels 3 miles upstream.
\n" ); document.write( " If the rate of the current is 3 mph, find the speed of the boat in still water.
\n" ); document.write( ":
\n" ); document.write( "Let r = speed of boat in still water
\n" ); document.write( "then
\n" ); document.write( "(r+3) = effective speed downstream
\n" ); document.write( "and
\n" ); document.write( "(r-3) = effective speed upstream
\n" ); document.write( ":
\n" ); document.write( "Times are equal so write a time equation; Time = dist/speed
\n" ); document.write( ":
\n" ); document.write( "Time upstream = Time downstream
\n" ); document.write( " $\"3%2F%28r-3%29\"$ = $\"5%2F%28r%2B3%29\"$
\n" ); document.write( "Cross multiply and find r \n" ); document.write( "

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