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 $30^{\circ}$. 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 $60^{\circ}$. Then the time taken (in minutes) by him, from B to reach
the pillar, is :
