document.write( "Question 213173: A boy can row a boat at a constant rate of 3mi/hr in still water. He rows up-stream for 20 minutes and then rows down-stream, returning to his starting point in another 15 minutes. Find the total distance traveled. \n" ); document.write( "
Algebra.Com's Answer #161147 by stanbon(75887)\"\" \"About 
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A boy can row a boat at a constant rate of 3mi/hr in still water. He rows up-stream for 20 minutes and then rows down-stream, returning to his starting point in another 15 minutes. Find the total distance traveled.
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\n" ); document.write( "Upstream DATA:
\n" ); document.write( "time = 1/5 hr ; rate = 3+c ; distance = rt = (1/5)(3+c) miles
\n" ); document.write( "------------------------------------
\n" ); document.write( "Downstream DATA:
\n" ); document.write( "time = 1/4 hr ; rate = 3-c ; distance = rt = (1/4)(3-c) miles
\n" ); document.write( "------------------------------------
\n" ); document.write( "Equation:
\n" ); document.write( "Up distance = Down distance
\n" ); document.write( "(1/5)(3+c) = (1/4)(3-c)
\n" ); document.write( "Multiply both sides by 20 to get:
\n" ); document.write( "4(3+c) = 5(3-c)
\n" ); document.write( "12+4c = 15-5c
\n" ); document.write( "9c = 3
\n" ); document.write( "c = 1/3 mph (speed of the current
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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