document.write( "Question 1167761: Brittany and Hanna can paddle 12 mi upstream in the same time it takes to paddle 28 mi downstream. Determine their paddling rate in still water if the stream flows at 2 mi/hr. \n" ); document.write( "

Algebra.Com's Answer #792363 by ikleyn(52906) $\"\"$ $\"About$

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document.write( "The \"time\" equation is\r\n" );
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document.write( "     = ,\r\n" );
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document.write( "where \" u \" is the paddling rate in still water.\r\n" );
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document.write( "From the equation\r\n" );
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document.write( "    12*(u + 2) = 28*(u-2)\r\n" );
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document.write( "    12u + 24   = 28u - 56\r\n" );
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document.write( "    24 + 56 = 28u - 12u\r\n" );
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document.write( "    80      = 16u\r\n" );
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document.write( "    u       = 80/16 = 5.\r\n" );
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document.write( "ANSWER.  Their paddling rate in still water is 5 miles per hour.\r\n" );
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