There are 2 vertical flagposts of heights 5*(31/2) m and 10*(31/2) m respectively, which are 10 meters apart. Vineet picks up a random point on the ground between the flagposts and observes the angle of elevation of the 2 flagposts. What is the chance that Vineet will find both the falgposts subtending an angle of atleast 60 degrees?

1) 50
2) 75
3) 100
4) none of these