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[" A man is walking towards a vertical pillar in a "],[" straight path,at a uniform speed.At a certain point "],[A" on the path,he observes that the angle of "],[" elevation of the top of the pillar is "30^(8)" .After walking "],[" for "10" minutes from "A" in the same direction,at "],[" a point "B," he observes that the angle of elevation "],[" of the top of the pillar is "60^(@)." Then the time taken "],[" (in minutes) by him,form "B" to reach the pillar,is: "]

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A man is walking towards a vertical pillar in a straight path, at a uniform speed. At a cetrain point A on the path, he observves that the angle of elevation of the top of the pillar is 30^(@) . After walking for 10 minutes from A in the same direction, at a point B, he observes that the angle of elevation of the top of the pillar is 60^(@) . Then the time taken (in minutes ) by him, from B to reach the pillar, is

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