document.write( "Question 1081664: two fishing boats, A, and B, are anchored 4500 feet apart in open water. A plane flies at a constant speed in a straight path directly over the two boats, maintaining a constant altitude. At one point during the flight, the angle of depression to A is 85°, and the angle of depression to B is 25°. Ten seconds later the plane has passed over A and spots B at a 35° angle of depression. How fast is the plane flying? \n" ); document.write( "

Algebra.Com's Answer #695722 by josgarithmetic(39617) $\"\"$ $\"About$

You can put this solution on YOUR website!
This really needs a figure, which I do not show here. There will be two triangles, sharing a diagonal. The top segment and bottom segment of the combined figure are parallel. Endpoints of the bottom segment are boats A and B. Endpoints of the top segment mark the places where angles of depression were measured. Time for movement given for that segment of distance was 10 seconds. \r
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\n" ); document.write( "\n" ); document.write( "The distance in feet traveled during those 10 seconds was...\r
\n" ); document.write( "\n" ); document.write( " $\"4500%28%28sin%2895%29%29%28sin%2810%29%29%29%2F%28%28sin%2860%29%29%28sin%28145%29%29%29\"$ \r
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\n" ); document.write( "\n" ); document.write( "Not a complete solution; only the distance traveled in the 10 seconds time interval. \n" ); document.write( "

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