document.write( "Question 1199944: An airplane is flying east at a constant altitude of 28,000 meters. The pilot spots a ship at an angle of
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Algebra.Com's Answer #833930 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "An airplane is flying east at a constant altitude of 28,000 meters.
\n" ); document.write( "The pilot spots a ship at an angle of depression of 18.5 degrees.
\n" ); document.write( "After 73 seconds the angle of depression is 38.4 Degrees.
\n" ); document.write( "Find the speed of the plane.
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document.write( "For the angle of 18.5°,  tan(18.5°) = ,\r\n" );
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document.write( "where    is the first horizontal diatance, measured at the sea level.\r\n" );
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document.write( "So,   =  =  = 83682 meters.\r\n" );
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document.write( "For the angle of 38.4°,  tan(38.4°) = ,\r\n" );
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document.write( "where    is the second horizontal diatance, measured at the sea level.\r\n" );
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document.write( "So,   =  =  = 35327 meters.\r\n" );
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document.write( "Thus, in 73 seconds, the airplane covered  83682 - 35327 = 48355 meters.\r\n" );
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document.write( "Hence, the speed of the airplane is   = 662.397 m/s = 2384 km/h.    ANSWER\r\n" );
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\n" ); document.write( "\n" ); document.write( "To which direction the airplane is flying (east, west, north, south), it does not matter.\r
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\n" ); document.write( "\n" ); document.write( "What does really matter in this problem, is that the pilot sees the ship straight ahead.\r
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