As observed from the top of 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 ship during the period of observation is
tan 600=√3 / 1 and √3 = perpendicular and 1 = base now √3 = 120 √3, then 1 = 120 same thing will use for tan 30 0 it become 1 = 120 √3, then √3 = 360 360 - 120 = 240 m
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