document.write( "Question 74234: I need help setting up this problem so I can solve it. Can anyone please help? \r
\n" ); document.write( "\n" ); document.write( "A motor boat can run 25 mph in still water. The boat starts at 7:00 am going upstream in a river whose current runs at 5 mph. How far up the river can the boat go and still be back at 12:00 noon? \r
\n" ); document.write( "\n" ); document.write( "Thank You!
\n" ); document.write( "

Algebra.Com's Answer #53234 by checkley75(3666)\"\" \"About 
You can put this solution on YOUR website!
DISTANCE=RATE*TIME. THE TWO DISTANCES ARE THE SAME THUS WE HAVE:
\n" ); document.write( "20X=30(5-X)
\n" ); document.write( "20X=150-30X
\n" ); document.write( "20X=30X=150
\n" ); document.write( "50X=150
\n" ); document.write( "X=150/50
\n" ); document.write( "X=3 HOURS GOING UP STEAM. THUS 2 HOURS(5-3=2) RETURN DOWN STREAM.
\n" ); document.write( "PROOF
\n" ); document.write( "20*3=30(5-3)
\n" ); document.write( "60=30*2
\n" ); document.write( "60=60
\n" ); document.write( "
\n" );