document.write( "Question 286194: The speed of a boat in still water is 10mph . it travels 15 miles upstream and 15 miles downstream in a total time of 4 hours. what is the speed of the current? \n" ); document.write( "
Algebra.Com's Answer #207649 by richwmiller(17219)\"\" \"About 
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(10+c)*x=15
\n" ); document.write( "(10-c)*y=15
\n" ); document.write( "x+y=4
\n" ); document.write( "c = 5, x = 1, y = 3
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