document.write( "Question 522515: Steamer cruises 58 kilometers downstream in the same time that is cruises 40 kilometers upstream. The engines drive the steamer in calm water at a rate which is 20 km/hr more than the rate of the current. Find the rate of the current.\r
\n" ); document.write( "\n" ); document.write( "How do I set this up?
\n" ); document.write( "

Algebra.Com's Answer #346909 by mananth(16946)\"\" \"About 
You can put this solution on YOUR website!
let current speed = x
\n" ); document.write( "steamer speed = x+20\r
\n" ); document.write( "\n" ); document.write( "upstream speed = (x+20-x)=20 mph
\n" ); document.write( "downstream speed = 2x+20\r
\n" ); document.write( "\n" ); document.write( "upstream distance = 40
\n" ); document.write( "downstream distance = 58\r
\n" ); document.write( "\n" ); document.write( "times are same\r
\n" ); document.write( "\n" ); document.write( "t=d/r\r
\n" ); document.write( "\n" ); document.write( "40/20 = 58/(2x+20)
\n" ); document.write( "cross multiply
\n" ); document.write( "40(2x+20)=58*(20)
\n" ); document.write( "80x+800=1160
\n" ); document.write( "80x=1160-800
\n" ); document.write( "80x=360
\n" ); document.write( "x=4.5 mph\r
\n" ); document.write( "\n" ); document.write( "m.ananth@hotmail.ca
\n" ); document.write( "
\n" );