An observer on the top of a tree ,finds the angle of depression of a car moving towards the tree to be `30^@` .After 3 minutes this angle becomes `60 ^@`.After how much more time , the car will reach the tree ?

From the top of a rock 50sqr(3) m high, the angle of depression of car on the ground is observed to be 30^(@) . Find the distance of the car from the rock.

From a boat, which is moving towards a bridge, the angle of elevation of bridge is 30^(@) . After 10 minutes, the angle of elevation becomes 60^(@) . Find how much more time will take the boat to reach at the bridge?

From a boat, which is moving towards a bridge, the angle of elevation of bridge is 30^(@) . After 10 minutes, the angle of elevation becomes 60^(@) . Find how much more time will take the boat to reach at the bridge?

From the top of a 10 m height tree the angle of depression of a point on the ground is 30^@ then the distance of the point from the foot of the tree is

A man from the top of a 100 metres high tower sees a car moving towards the tower at an angle of depression of 30^@ . After some time, the angle of depression becomes 60^@ .The distance (in metres) travelled by the car during this time is