document.write( "Question 330751: A motor boat takes 4 hours to travel 352 km going upstream. The return trip takes 2 hours going downstream. What is the rate of the boat in still water and what is the rate of the current? \n" ); document.write( "
Algebra.Com's Answer #237110 by nyc_function(2741)\"\" \"About 
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Let b = speed of boat in still water\r
\n" ); document.write( "\n" ); document.write( "Let r = speed of current\r
\n" ); document.write( "\n" ); document.write( "We use D = rt.\r
\n" ); document.write( "\n" ); document.write( "Upstream:\r
\n" ); document.write( "\n" ); document.write( "rate = b + r\r
\n" ); document.write( "\n" ); document.write( "time = 4\r
\n" ); document.write( "\n" ); document.write( "distance = 352\r
\n" ); document.write( "\n" ); document.write( "Downstream:\r
\n" ); document.write( "\n" ); document.write( "rate = b - r\r
\n" ); document.write( "\n" ); document.write( "time = 2\r
\n" ); document.write( "\n" ); document.write( "distance = 352\r
\n" ); document.write( "\n" ); document.write( "From this information we make two equations in two unknowns.\r
\n" ); document.write( "\n" ); document.write( "I will set up the equations and you can finish.\r
\n" ); document.write( "\n" ); document.write( "4(b + r) = 352...Equation A
\n" ); document.write( "2(b - r) = 352...Equation B\r
\n" ); document.write( "\n" ); document.write( "This is a good start for you. I'm sure you can finish now.\r
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