document.write( "Question 69468: The question is:\r
\n" ); document.write( "\n" ); document.write( "A motorboat took 3 hours to make a downstream trip with a current of 6 km/hr. The return trip against the same current took 5hrs. Find the speed of the boat in still water. \r
\n" ); document.write( "\n" ); document.write( "I am not sure how to solve resistance problems. If you could just tell me the formula or how to get started, that would be great. thanks.
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Algebra.Com's Answer #49476 by Nate(3500)\"\" \"About 
You can put this solution on YOUR website!
With Current:
\n" ); document.write( "rate = r + 6
\n" ); document.write( "time = 3
\n" ); document.write( "distance = 3(r + 6)
\n" ); document.write( "Against Current:
\n" ); document.write( "rate = r - 6
\n" ); document.write( "time = 5
\n" ); document.write( "distance = 5(r - 6)
\n" ); document.write( "3(r + 6) = 5(r - 6)
\n" ); document.write( "3r + 18 = 5r - 30
\n" ); document.write( "48 = 2r
\n" ); document.write( "24km/hr = r
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