document.write( "Question 469754: it took a crew 4 hrs and 48 min to row 10.8 km upstream and back again. if the rate of flow of the stream was 3km/hr , what was the rowing rate of the crew in still water ?\r
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document.write( "_______km/hr \n" );
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Algebra.Com's Answer #322250 by stanbon(75887)![]() ![]() ![]() You can put this solution on YOUR website! it took a crew 4 hrs and 48 min to row 10.8 km upstream and back again. \n" ); document.write( "if the rate of flow of the stream was 3km/hr , what was the rowing rate of the crew in still water ? \n" ); document.write( "--- \n" ); document.write( "Roundtrip DATA: \n" ); document.write( "time = 4 4/5 hrs ; distance = 10.8 km ; rate = 10.8/(24/5)= 2.25 mph \n" ); document.write( "----- \n" ); document.write( "Equation: \n" ); document.write( "Upstream rate = s-3 \n" ); document.write( "Downstream rate = s+3 \n" ); document.write( "--- \n" ); document.write( "Average rate: \n" ); document.write( "(s + 3 + s-3)/2 = 2.25 \n" ); document.write( "2s/2 = 2.25 \n" ); document.write( "s = 2.25 mph rate in still water \n" ); document.write( "==================================== \n" ); document.write( "Cheers, \n" ); document.write( "Stan H. \n" ); document.write( "============= \n" ); document.write( " \n" ); document.write( " |