1. The angle of elevation of the top of a tower at a point on the ground is 30O. On walking 24 m towards the tower, the angle of elevation becomes 60O. Find the height of the tower.

(a) 2.076 m
(b) 20.67 m
(c) 2 m
(d) None of these

2. A man wishes to find the height of a flag post which stands on a horizontal plane; at a point on this plane he finds the angle of elevation of the top of the flagpost to be 45O. On walking 30 meters towards the town he finds the corresponding angle of elevation to be 60O. Find the height of the flag post?

(a) 69 m
(b) 70 m
(c) 71 m
(d) 74 m

3. A man on the top of a town, standing on the sea share finds that a boat coming towardes him takes 10 minutes for the angle of depression to change from 30O to 60O. Find the time taken by the boat to reach the shore from the position.

(a) 5 min
(b) 10 min
(c) 8 min
(d) 15 min

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