document.write( "Question 1110579: bill can row 3 mph in still water. it takes him 3 hours and 36 minds to go 3 miles upstream and return. find the speed of the current. \n" ); document.write( "

Algebra.Com's Answer #725563 by ikleyn(52786) $\"\"$ $\"About$

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document.write( "Let r = speed of the current.\r\n" );
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document.write( "Then your \"time\" equation is\r\n" );
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document.write( " +  = \r\n" );
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document.write( " +  = \r\n" );
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document.write( " +  = \r\n" );
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document.write( " +  = \r\n" );
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document.write( "5*(3-r) + 5*(3 + r) = \r\n" );
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document.write( "30 = 54 - 6r^2\r\n" );
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document.write( "5 = 9 - r^2\r\n" );
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document.write( "r^2 = 9-5 = 4  ====>  r = sqrt(4) = 2.\r\n" );
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document.write( "Answer.  Speed of the current is 2 km/h.\r\n" );
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\n" ); document.write( "It is a typical and standard Upstream and Downstream round trip word problem.\r
\n" ); document.write( "\n" ); document.write( "You can find many similar fully solved problems on upstream and downstream round trips with detailed solutions in lessons \r
\n" ); document.write( "\n" ); document.write( "    - Wind and Current problems \r
\n" ); document.write( "\n" ); document.write( "    - More problems on upstream and downstream round trips \r
\n" ); document.write( "\n" ); document.write( "    - Wind and Current problems solvable by quadratic equations \r
\n" ); document.write( "\n" ); document.write( "    - Unpowered raft floating downstream along a river\r
\n" ); document.write( "\n" ); document.write( "    - Selected problems from the archive on the boat floating Upstream and Downstream \r
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\n" ); document.write( "\n" ); document.write( "Read them attentively and learn how to solve this type of problems once and for all.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this textbook under the section \"Word problems\", the topic \"Travel and Distance problems\".\r
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\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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