2 yachts leave a dock at the same time, but sail in different directions. The yacht named Salma is sailing? - sailing yachts
West and the sailing yacht as Terner north. Two hours. later, on 2 Yachts 17 km. At that time the port radar system shows, the sea is 17 miles. At this point, the port radar system shows that the list is 7 km away from the dock assumed that Salma. To what extent Terner on the bench?
a. 8 km
b. 15. km
c. 17 km
D 10 km
Thursday, January 21, 2010
Sailing Yachts 2 Yachts Leave A Dock At The Same Time, But Sail In Different Directions. The Yacht Named Salma Is Sailing?
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1 comments:
Let x = distance between the dock Salma
x + 7 = distance from the pier Terner
x ² + (x +7) ² = 17 ²
x ² + x ² + 14x + 49 = 289
2x ² + 14x - 240 = 0
x ² + 7x - 120 = 0
(x + 15) (x - 8) = 0
(x + 15) = 0
x = -15 reject negative
(x - 8) = 0
x = 8 km, distance from the pier Salma
8 + 7 = 15 km, distance from the pier Terner
Answer b. 15 km
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