document.write( "Question 448878: A river has a current of 5 mph. A boat can make a trip of 20 miles upstream in the same time it can make a trip of 30 miles downstream find the rate of the boat in still water \n" ); document.write( "
Algebra.Com's Answer #311916 by jorel1380(3719)![]() ![]() You can put this solution on YOUR website! 30/x+5=20/x-5 \n" ); document.write( "20(x+5)=30(x-5) \n" ); document.write( "20x+100=30x-150 \n" ); document.write( "10x=250 \n" ); document.write( "x=25 \n" ); document.write( "The speed of the boat in still water is 25 mph... \n" ); document.write( " |