http://boatssailing.com/2-yachts-leave-a-dock-at-the-same-time-but-sail-in-different-directions-the-yacht-named-salma-is-sailing All about boats, yachts and sailing Wed, 08 Feb 2012 21:45:39 +0000 http://wordpress.org/?v=2.7 hourly 1 http://boatssailing.com/2-yachts-leave-a-dock-at-the-same-time-but-sail-in-different-directions-the-yacht-named-salma-is-sailing/comment-page-1#comment-468 Jerome J Sat, 16 Jan 2010 19:26:39 +0000 http://boatssailing.com/2-yachts-leave-a-dock-at-the-same-time-but-sail-in-different-directions-the-yacht-named-salma-is-sailing#comment-468 Let x = distance of Salma from dock x + 7 = distance of Terner from dock x² + (x + 7)² = 17² x² + x² + 14x + 49 = 289 2x² + 14x - 240 = 0 x² + 7x - 120 = 0 (x + 15)(x - 8) = 0 (x + 15) = 0 x = -15 discard, negative (x - 8) = 0 x = 8 km, distance of Salma from dock 8 + 7 = 15 km, distance of Terner from dock Answer b. 15 km Let x = distance of Salma from dock
x + 7 = distance of Terner from dock
x² + (x + 7)² = 17²
x² + x² + 14x + 49 = 289
2x² + 14x - 240 = 0
x² + 7x - 120 = 0
(x + 15)(x - = 0
(x + 15) = 0
x = -15 discard, negative
(x - = 0
x = 8 km, distance of Salma from dock
8 + 7 = 15 km, distance of Terner from dock
Answer b. 15 km

]]>