document.write( "Question 452071: a boat can travel 18 miles up a river in the same amount of time it takes to travel 42 miles down the same river. if the current is 2 miles per hour, what is the speed in still water? \n" ); document.write( "

Algebra.Com's Answer #310817 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A boat can travel 18 miles up a river in the same amount of time it takes to travel 42 miles down the same river.
\n" ); document.write( " If the current is 2 miles per hour, what is the speed in still water?
\n" ); document.write( ":
\n" ); document.write( "Let s = boat speed in still water
\n" ); document.write( "then
\n" ); document.write( "(s+2) = effective speed downstream
\n" ); document.write( "and
\n" ); document.write( "(s-2) = effective speed upstream
\n" ); document.write( ":
\n" ); document.write( "Write time equation, time = dist/speed
\n" ); document.write( ":
\n" ); document.write( " $\"42%2F%28%28s%2B2%29%29\"$ = $\"18%2F%28%28s-2%29%29\"$
\n" ); document.write( "cross multiply and solve for s
\n" ); document.write( " \n" ); document.write( "

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