document.write( "Question 883918: A boat travels 30 miles upstream in three hours. It makes the return trip in one and a half hours. What is the speed of the boat in still water? \n" ); document.write( "
Algebra.Com's Answer #533863 by Alan3354(69443)\"\" \"About 
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Use d = r*t, r = d/t to find the speed up and downstream.
\n" ); document.write( "The boat's speed is the average of the 2.
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