A man standing on a railway bridge `5sqrt3` meters high, observes the engine of a train at an angle of depression `30^@`. But after 2 seconds, he observes the engine at an angle of depression `45^@` on the other side of the bridge. Find the speed of the train.

A man standing on a railway overbirdge of 5sqrt3 m height observed the engine of the train from one side of the bridge at an angle of depression of 30^@ . But just after 2 seconds, he observed the engine at an angle of depression of 45^@ from the other side of the bridge. Find the speed of the train.

Laxmidevi standing on a railway overbridge of 5sqrt(3) metres height observed the engine of the train from one side of the bridge of depression of 30^(@) . But just after 2 seconds, she observed the engine at an angle of depression of 45^(@) from the other side of the bridge. Find the speed of the train in metres per second.

A man standing in the midst of a field observes, a flying bird in his north at an angle of elevation of 30^@ and after 2.5 minutes he observes the bird in his south at an angle of elevation of 60^@ . If the bird flies in a straight line all along at a height of 60sqrt3 metres, what is its speed?

A straight highway leads to the foot of tower. Ramaiah standing at the top of the tower observes a car at an angle of depression 30^(@) . The car 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.

Monu standing in the midst of a field, observes a flying bird in his north at an angle of elevation of 30^(@) and after 2 minutes he observer the bird in his south at an angle of elevation of 60^(@) . If the bird flies in a straight line all along at a height of 50sqrt(3) metres, find its speed in kilometre per hour.

Mohit, standing in the midst of a field, observes a flying birds in his north at an anlge of elevation of 30^@ and after 2 minutes he observes the birds in his south at an angle of elevation of 60^@ . If the bird flies in a straight line all along at a height of 50sqrt3 metres then find its speed in km//hr .

Narayan, standing in the midst of a field, observes a flying bird in his north at an angle of elevation of 30^@ and aft er 21 minutes he observes the bird in his south at an angle of elevation of 60^@ . If the bird flies in a s traight line all a height of 50sqrt3 metres, then find its speed in metre per minuts.

Find the angle of depression of a boat from the bridge at a horizontal distance of 25 m from the bridge, if the height of the bridge is 25sqrt3 m____

A man standing on the deck of a ship, which is 10m above the water level, observes the angle of elevation of the top of a hill as 60^@ and the angle of depression of the base of the hill as 30^@ . Calculate the distance of the hill from the ship and the height of the hill.

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 ?