document.write( "Question 581785: IT took 3 hours to row a boat 18 km against the current. The return trip with the current took1 1/2 hours. Find the speed of the rowboat in still water. \n" ); document.write( "
Algebra.Com's Answer #371821 by Alan3354(69443)\"\" \"About 
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IT took 3 hours to row a boat 18 km against the current. The return trip with the current took1 1/2 hours. Find the speed of the rowboat in still water.
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\n" ); document.write( "18/3 = 6 km/hr
\n" ); document.write( "18/1.5 = 12 km/hr
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\n" ); document.write( "The boat's speed is the avg = (6 + 12)/2
\n" ); document.write( "= 9 km/hr
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