document.write( "Question 509344: a motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes the return takes 15 minutes. what is the speed of the current? \n" ); document.write( "
Algebra.Com's Answer #341393 by stanbon(75887)\"\" \"About 
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a motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes the return takes 15 minutes. what is the speed of the current?
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\n" ); document.write( "Upstream DATA:
\n" ); document.write( "time = 1/3 hr ; rate = 16-c mph ; distance = r*t = (1/3)(16-c) miles
\n" ); document.write( "-----
\n" ); document.write( "Downstream DATA:
\n" ); document.write( "time = 1/4 hr ; rate = 16+c mph ; distance = r*t = (1/4)(16+c)
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\n" ); document.write( "Equation:
\n" ); document.write( "distance = distance
\n" ); document.write( "(1/3)(16-c) = (1/4(16+c)
\n" ); document.write( "----
\n" ); document.write( "4(16-c) = 3(16+c)
\n" ); document.write( "64-c = 48+c
\n" ); document.write( "16 = 2c
\n" ); document.write( "current = 8 mph
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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