document.write( "Question 905044: Jose’s boat has a top speed of 20 miles per hour in still water.
\n" ); document.write( " While traveling on a river at top speed, he went 40 miles upstream in the same amount of time he went 60 miles downstream. Find the rate of the river current. \n" ); document.write( "
Algebra.Com's Answer #548999 by richwmiller(17219)\"\" \"About 
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\n" ); document.write( "r*t=d
\n" ); document.write( "(20+c)*t=60
\n" ); document.write( "(20-c)*t=40
\n" ); document.write( "20t+c*t=60
\n" ); document.write( "20t-c*t=40
\n" ); document.write( "add
\n" ); document.write( "40t=100
\n" ); document.write( "t=10/4
\n" ); document.write( "t=5/2=2.5 hours
\n" ); document.write( "(20+c)*t=60
\n" ); document.write( "(20+c)*2.5=60
\n" ); document.write( "20+c=24
\n" ); document.write( "c=4 mph\r
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