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The angle of elevation of the top of a tower at a point G on the ground is 30^(@) . On walking 20 m towards the tower the angle of elevation becomes 60^(@) . The height of the tower is equal to :

The angle of elevation of the top of a tower from the foot of a house, situated at a distance of 20 m from the tower is 60^(@) . From the top of the top of the house the angle of elevation of the top of the tower os 45^(@) . Find the height of house and tower.

When Rahul walks up a stationary escalator,then he takes 20s to reach the top.While when he walks up a moving escalator,he takes 10s to reach the top.The time taken by him to reach the top when stand still on the moving escalator is?

A Roller coaster is desigend such that riders experience "Weightlessness " as they go round the top of a hill whose radius of curvature is 20 m. The speed of the car at the top of the hill is between