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** Q 3020067811. ** A man is standing on the deck of a ship which is 8 m above water level. He observes the angle of elevation of the top of a hill as `60^{\circ}` and the angle of depression of the base of the hill as ` 30^{\circ}`. If the distance of the hill from the ship given by `a\sqrt b`, then find the value of `a-b`.