document.write( "Question 598639: A tugboat goes 180 miles upstream in 15 hours. The return trip downstream takes 10 hours. Find the speed of the tugboat wihtout a current and the speed of the current. \n" ); document.write( "
Algebra.Com's Answer #378646 by stanbon(75887)\"\" \"About 
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A tugboat goes 180 miles upstream in 15 hours. The return trip downstream takes 10 hours. Find the speed of the tugboat wihtout a current and the speed of the current.
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\n" ); document.write( "Upstream DATA:
\n" ); document.write( "distance = 180 miles ; time = 15 hrs ; rate = 180/15 = 12 mph
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\n" ); document.write( "Downstream DATA:
\n" ); document.write( "distance = 180 miles ; time = 10 hrs ; rate = 180/10 = 18 mph
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\n" ); document.write( "Equation:
\n" ); document.write( "Upstream: b - c = 12 mph
\n" ); document.write( "Downstrm: b + c = 18 mph
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\n" ); document.write( "Add and solve for \"b\":
\n" ); document.write( "2b = 30 mph
\n" ); document.write( "b = 15 mph (boat speed in still water)
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\n" ); document.write( "Solve for \"c\":
\n" ); document.write( "b + c = 18 mph
\n" ); document.write( "15 + c = 18
\n" ); document.write( "c = 3 mph (speed of the current)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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