document.write( "Question 540735: Going down a river, a boat went 12 km/h. Going up the river, the boat went only 2 km/h. How fast would the boat go if there was no current? \n" ); document.write( "
Algebra.Com's Answer #353837 by mananth(16946)\"\" \"About 
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let speed of boat in still water be x
\n" ); document.write( "current speed be y\r
\n" ); document.write( "\n" ); document.write( "with curent speed = x+y = 12\r
\n" ); document.write( "\n" ); document.write( "against current speed = x-y =2\r
\n" ); document.write( "\n" ); document.write( "x+y=12
\n" ); document.write( "x-y=2
\n" ); document.write( "add the two equations
\n" ); document.write( "2x=14
\n" ); document.write( "x=7 speed of boat in still water
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