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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Algebra.Com's Answer #322250 by stanbon(75887)\"\" \"About 
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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 ?
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\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
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\n" ); document.write( "Equation:
\n" ); document.write( "Upstream rate = s-3
\n" ); document.write( "Downstream rate = s+3
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\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
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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