A man on the top of a vertical tower observes a car moving at a uniform speed coming directly towards it. If it takes 12 minutes for the angle of depression to change from `30^0to45^0,` how soon after this will the car reach the tower? Give your answer to the nearest second.

A man observes a car from the top of a tower, which is moving towards the tower with a uniform speed. If the angle of depression of the car change from 30^(@)" and "45^(@) in 12 minutes, find the time taken by the car now toreach the tower.

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

A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of 30^@ , which is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60^@ . Find the time taken by the car to reach the foot of the tower from this point.

A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at an angle of depression of 30^@ , which is approaching the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60^@ . Find the time taken by the car to reach the foot of the tower from this point.

From the top of a light house, it is observed that a ship is sailing directly towards it and the angle of depression of the ship changes from 30^(@) " to " 45^(@) in 10 minutes. Assuming that the ship is sailing with uniform speed, calculate in how much more time (in minutes) will the ship reach the light house?

A straight highway leads to the foot of a tower. A man standing at the top of the tower observes a car at angle of depression of 30^@ , which is approaching to the foot of the tower with a uniform speed. Six seconds later, the angle of depression of the car is found to be 60^@ . Find the further time taken by the car to reach the foot of the tower.

The angle of elevation of the top of a tower from a point A on the ground is 30^0dot On moving a distance of 20 metres towards the foot of the tower to a point B the angle of elevation increases to 60^0dot Find the height of the ttower and the distance of the tower from the point A.

The angle of elevation of the top of a tower from a point A on the ground is 30^0dot On moving a distance of 20 metres towards the foot of the tower to a point B the angle of elevation increases to 60^0dot Find the height of the ttower and the distance of the tower from the point A.

A car is being driven, in a straight line and at a uniform speed, towards the base of a vertical tower of height 30 feet. The top of the tower is observed from the car and, in the process, the angle of elevation changes from 45^(@) at B to 60^(@) at A. What is the distance, in feet, to the nearest integer, between the points A and B?

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 ?