document.write( "Question 514789: If Jim's boat goes 30 mph upstream and 50 mph downsteam. What is the speed of the current and the boat in still water? I HAVE NO IDEA HOW TO SET THIS UP!! thanks! \n" ); document.write( "
Algebra.Com's Answer #343688 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! If Jim's boat goes 30 mph upstream and 50 mph downsteam. \n" ); document.write( " What is the speed of the current and the boat in still water? \n" ); document.write( ": \n" ); document.write( "Let s = speed of the boat in still water \n" ); document.write( "Let c = speed of the current \n" ); document.write( ": \n" ); document.write( "s + c = 50; downstream \n" ); document.write( "s - c = 30; upstream \n" ); document.write( "-------------------------adding eliminates c find s \n" ); document.write( "2s = 80 \n" ); document.write( "s = 80/2 \n" ); document.write( "s = 40 mph in still water \n" ); document.write( ": \n" ); document.write( "Find the current using the 1st equation \n" ); document.write( "40 + c = 50 \n" ); document.write( "c = 50 - 40 \n" ); document.write( "c = 10 mph is current \n" ); document.write( " |