document.write( "Question 850188: Alvin paddled for 5 hours within a 4km/h current to reach a campsite. The return of the trip against the same current took 9 hours. Find the speed of the boat in the still water. \n" ); document.write( "
Algebra.Com's Answer #512026 by richwmiller(17219)\"\" \"About 
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5*(x+4)=9*(x-4)
\n" ); document.write( "x = 14 kph for the boat
\n" ); document.write( "5*18=9*(10)
\n" ); document.write( "90=90
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