document.write( "Question 211029: A motorboat can maintain a constant speed of 34 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 39 minutes; the return trip takes 29 minutes. What is the speed of the current in miles per hour? \n" ); document.write( "
Algebra.Com's Answer #159416 by stanbon(75887)\"\" \"About 
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A motorboat can maintain a constant speed of 34 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 39 minutes; the return trip takes 29 minutes. What is the speed of the current in miles per hour?
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\n" ); document.write( "Distance upstream = (34-c)(39/60) miles
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\n" ); document.write( "Distance downstream = (34+c)(29/60) miles
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\n" ); document.write( "Equation:
\n" ); document.write( "distance = rate*time
\n" ); document.write( "distance up = distance down
\n" ); document.write( "(34-c)(39/60) = (34+c)(29/60)
\n" ); document.write( "Multiply both sides by 60 to get:
\n" ); document.write( "39(34-c) = 29(34+c)
\n" ); document.write( "39*34 - 39c = 29*34 + 29c
\n" ); document.write( "68c = 340
\n" ); document.write( "c = 5 mph (speed of the current)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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