document.write( "Question 739883: A barge can travel 45 miles downstream in the same time it takes to travel 30 miles upstream. If the speed of the barge in still water is 15 miles per hour, what is the speed of the current? \n" ); document.write( "

Algebra.Com's Answer #451374 by lwsshak3(11628) $\"\"$ $\"About$

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A barge can travel 45 miles downstream in the same time it takes to travel 30 miles upstream. If the speed of the barge in still water is 15 miles per hour, what is the speed of the current?
\n" ); document.write( "***
\n" ); document.write( "let x=speed of current
\n" ); document.write( "15+x=speed of barge downstream
\n" ); document.write( "15-x=speed of barge upstream
\n" ); document.write( "travel time=distance/speed (same both ways)
\n" ); document.write( "..
\n" ); document.write( " $\"45%2F%2815%2Bx%29=30%2F%2815-x%29\"$
\n" ); document.write( " $\"45%2815-x%29=30%2815%2Bx%29\"$
\n" ); document.write( " $\"675-45x=450%2B30x\"$
\n" ); document.write( "75x=225
\n" ); document.write( "x=3
\n" ); document.write( "speed of current=3 mph \n" ); document.write( "

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