document.write( "Question 813592: A boat can travel at a speed of 20 mph in still water. In a stream that has a current of 5 mph, the boat travels a certain distance down stream and returns. The ratio of the average speed for the round trip to the speed in still water. \n" ); document.write( "
Algebra.Com's Answer #489834 by TimothyLamb(4379)\"\" \"About 
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b = 20
\n" ); document.write( "w = 5
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\n" ); document.write( "s = d / t
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\n" ); document.write( "u = b - w = 15
\n" ); document.write( "d = b + w = 25
\n" ); document.write( "---
\n" ); document.write( "a = (u + d)/2 = 20
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\n" ); document.write( "Answer:
\n" ); document.write( "a/w = 20/5 = 4
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