As observed from the top a light house 120 3 m...

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As observed from the top a light house, 120√3 m above the sea level, the angle of depression of a ship sailing towards it changes from 30° to 60°. The distance travelled by the during the period of observation is:

A. 240 m

B. 240√3 m

C. 180√3 m

D. 180 m

Answer: Option A

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