SOLUTION: 17 From the top of a vertical cliff 68 m high, an observer notices a yacht at sea. The angle of depression to the yacht is 47�. The yacht sails directly away from the cliff, and

Question 714990: 17 From the top of a vertical cliff 68 m high, an observer
notices a yacht at sea. The angle of depression to the
yacht is 47�. The yacht sails directly away from the cliff,
and after 10 minutes the angle of depression is 15�. How
fast does the yacht sail?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!

T = top of the cliff (we assume eye of observer is there, 68 meters above water surface)
B = bottom of the cliff (at water level)
X = initial position of the yacht
Y = position of the yacht 10 minutes later
TH = a horizontal line, parallel to BY.
angle HTX = --> Angle BTX =
angle HTY = --> Angle BTY =

The yacht covered
in 10 minutes.
We could say that its speed in meters per minute is
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