document.write( "Question 162428: with the current, a sailboat travels 9 km in 3 hrs. however, if it travels against the current, it takes 3 times to sail the same distance. how fast is the boat sailing on still water? how fast does the river flow? \n" ); document.write( "
Algebra.Com's Answer #119793 by checkley77(12844)\"\" \"About 
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9/3=3 MPH DOWN STREAM.
\n" ); document.write( "9/(3*3)=9/9=1 KPH UPSTREAM.
\n" ); document.write( "(3-1)/2=2/2=1 KPH IS THE CURRENT.
\n" ); document.write( "PROOF:
\n" ); document.write( "3-1=2 KPH THE SPEED OF THE SAIL BOAT.
\n" ); document.write( "1+1=2 DITTO.
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