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 on a straight coast there are 3 objec...
 Entrance Exam
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on a straight coast there are 3 objects A,B and C such that AB=BC=2km a vessel approaches B in a line perpendicular to the coast,and at a certain point AC is found to subtend an angle of 60degrees afterr sailing a while in the same direction for 10 minutes AC is found to subtend an angle of 120degrees find the rate at which ship is going?
therefore BY RHS , triangle ABD is similar to triangle CBD
=> angle ADB and angle CDB = 30 degree each using similar triangle property
angle AEB = angle CEB = 60 degree
=> ED = 2 (3^{1/2})  ( 2 / 3^{1/2} ) { from eq 1 and 2 }