document.write( "Question 308613: a paddle boat can move at the speed of 20 km/h in still water. the boat is paddled 12km downstream in the same time it takes to go 6km upstream. what is the speed of the river. \n" ); document.write( "
Algebra.Com's Answer #220656 by mananth(16946)\"\" \"About 
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a paddle boat can move at the speed of 20 km/h in still water. the boat is paddled 12km downstream in the same time it takes to go 6km upstream. what is the speed of the river.\r
\n" ); document.write( "\n" ); document.write( "let the speed of the river be x mph\r
\n" ); document.write( "\n" ); document.write( "downstream:
\n" ); document.write( "distance 12 kms
\n" ); document.write( "speed = x+20 km/hr
\n" ); document.write( "Time = 12/ x+20
\n" ); document.write( "..
\n" ); document.write( "Upstream
\n" ); document.write( "Distance = 6 km
\n" ); document.write( "speed = 20-x km/hr
\n" ); document.write( "Time = 6/ 20-x
\n" ); document.write( ".
\n" ); document.write( "Time taken is same
\n" ); document.write( "12/ x+20 = 6 / 20-x
\n" ); document.write( "12(20-x)=6(x+20)
\n" ); document.write( "240-12x= 6x+120
\n" ); document.write( "-18x=-120
\n" ); document.write( "x= 6.66 km/hr the speed of the river\r
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