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As observed form the top of a lighthouse, 100 m above sea level, the angle of depression of a ship, sailing directly towards

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As observed form the top of a lighthouse, 100 m above sea level, the angle of depression of a ship, sailing directly towards it, changes from 30° and 60° . Determine the distance travelled by the ship during the period of observation. 

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Let OA be the lighthouse and B and C be the positions of the ship. 

Thus, we have:

Distance travelled by the ship during the period of observation = B  = y = 115.47 m

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