A plane covers a distance of 800 m horizontally on the runway before taking off at an angle of 30°. If the final height of the plane from the ground is 2 km, then how much total distance (in meters) has it covered horizontally?

Two persons are on diametrically opposite sides of a tower. They measure the angles of elevation of the top of the tower as 30° and 60° respectively. If the height of the tower is 100 m, what is the approximate distance between the two persons?

At a point on level ground, the tangent of the angle of elevation of the top of a tower is found to be 56. On walking 70 m towards the tower, the tangent of the angle of elevation of the top of the tower is found to be 98. What is the height of the tower?