document.write( "Question 937217: Jane is 2 miles offshore in a boat and wishes to reach a coastal village 6 miles down a straight shoreline from the point nearest the boat. She can row 2 mph and can walk 5 mph. Where should she land her boat to reach the village in the least amount of time? \n" ); document.write( "
Algebra.Com's Answer #571179 by ankor@dixie-net.com(22740)![]() ![]() You can put this solution on YOUR website! 2 miles offshore in a boat and wishes to reach a coastal village 6 miles down a straight shoreline from the point nearest the boat. \n" ); document.write( " She can row 2 mph and can walk 5 mph. \n" ); document.write( " Where should she land her boat to reach the village in the least amount of time? \n" ); document.write( ": \n" ); document.write( "Boat \n" ); document.write( " | \n" ); document.write( " | \n" ); document.write( "2 mi \n" ); document.write( " | \n" ); document.write( " | \n" ); document.write( " .----x-----*-------(6-x)--------V \n" ); document.write( "* is the landing point which is (6-x) away from the village \n" ); document.write( ": \n" ); document.write( "The rowing distance to * equals the hypotenuse, which is \n" ); document.write( "The walking distance from * to the village is (6-x) \n" ); document.write( "f(x) = time to the village (time = dist/speed) \n" ); document.write( "f(x) = \n" ); document.write( "Graph: \n" ); document.write( "time = rowing time + walking time \n" ); document.write( "y = \n" ); document.write( " \n" ); document.write( "minimum time occurs when x = .87 mi, 2.1 hrs is min time, therefore \n" ); document.write( "land the boat: 6 - .87 = 5.13 mi from the village \n" ); document.write( " \n" ); document.write( " |