document.write( "Question 379034: A paddle boat can move at a speed of 4km/h in still water. The boat is paddled 121km downstream in a river in the same time it takes to go 6km upstream. What is the speed of the river? The speed of the river is___km/h \n" ); document.write( "
Algebra.Com's Answer #269177 by ewatrrr(24785)\"\" \"About 
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\n" ); document.write( "Hi,
\n" ); document.write( "D = r*t OR t = D/r Question sets up an equality according to time it takes
\n" ); document.write( "Let c represent the rate of the current
\n" ); document.write( "\"121km%2F%284kmph+%2B+c%29+=+6km%2F%284kmph+-+c%29\"
\n" ); document.write( "cross mulitply to solve for x
\n" ); document.write( "121(4 - c) = 6(4 + c)
\n" ); document.write( "484 - 121c = 24 + 6c
\n" ); document.write( "460 = 127c
\n" ); document.write( "3.622kmph = c, the rate(speed) of the current
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