document.write( "Question 1147349: David and Amy start at the same point and begin biking in different directions. David is biking west at a speed of 17 miles per hour. Amy is biking south at a speed of 15 miles per hour. After how many hours will they be exactly 23 miles apart? Round your answer to two decimal places. \r
\n" ); document.write( "\n" ); document.write( "I have tried setting it up as 15x+17x=23 (my answer was 0.72 and it was wrong). \n" ); document.write( "
Algebra.Com's Answer #768663 by Alan3354(69443)\"\" \"About 
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David and Amy start at the same point and begin biking in different directions. David is biking west at a speed of 17 miles per hour. Amy is biking south at a speed of 15 miles per hour. After how many hours will they be exactly 23 miles apart? Round your answer to two decimal places.
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\n" ); document.write( "It's a right triangle, and 23 miles is the hypotenuse.
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\n" ); document.write( "t = time in hours
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\n" ); document.write( "(17t)^2 + (15t)^2 = 23^2
\n" ); document.write( "289t^2 + 225t^2 = 529
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\n" ); document.write( "Solve for t
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\n" ); document.write( "Odd that it says \"exactly 23 miles\" then says round to 2 places.\r
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