document.write( "Question 22105: River flows at 2 mph. Phil can paddle in still water at 8 mph. If he is 4 miles downstream from a log floating toward him,
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document.write( "how long will it take him to reach the log? \n" );
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Algebra.Com's Answer #854319 by ikleyn(53875) You can put this solution on YOUR website! . \n" ); document.write( "River flows at 2 mph. Phil can paddle in still water at 8 mph. If he is 4 miles downstream from a log floating toward him, \n" ); document.write( "how long will it take him to reach the log? \n" ); document.write( "~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " The solutions in the posts by @Paul and by @JWG both are incorrect.\r \n" ); document.write( "\n" ); document.write( " For the correct solution see that follows in my post.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \r\n" ); document.write( "According to the problem's context, Phil paddles upstream, while the log is floating toward him, i.e. downstream.\r\n" ); document.write( "\r\n" ); document.write( "The Phil effective rate relative the river's banks is 8-2 = 6 miles per hour.\r\n" ); document.write( "\r\n" ); document.write( "The log floats toward Phil with the rate 2 miles per hour, so their approaching rate is 6+2 = 8 miles per hour.\r\n" ); document.write( "\r\n" ); document.write( "\r\n" ); document.write( "Hence, the time when Phil will reach the log is\r \n" ); document.write( "\n" ); document.write( "Solved.\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |