A man is observing from the top of a tower a boat speeding away from the tower. The boat makes an angle of depression of 45 with the man's eye when at a distance of 60 m from the tower. After 5 second, the angle of depression becomes 30 , Find the speed of the boat, assuming that it is running in still water.

A man is observing from the top of a tower a boat speeding away from t

1.	A man is observing from the top of a tower a boat speeding away from the tower. The boat makes an angle of depression of 45 with the man's eye when at a distance of 60 m from the tower. After 5 second, the angle of depression becomes 30 , Find the speed of the boat, assuming that it is running in still water.
A.	30 km/hr.
B.	31.5 km/hr
C.	33 km/hr
D.	34 km/hr
Answer» C. 33 km/hr

Discussion

No Comment Found

Related MCQs

An observer 1.6 m tall is 20 away from a tower. The angle of elevation from his eye to the top of the tower is 30°. The height of the tower is:
The angle of elevation of the sun, when the length of the shadow of a tree times the height of the tree, is:
An observer 1.6 m tall is 20 away from a tower. The angle of elevation from his eye to the top of the tower is 30°. The height of the tower is:
The angle of elevation of the sun, when the length of the shadow of a tree times the height of the tree, is:
From the top of h meter high cliff the angles of depression of the top and the button of a tower are observed to be 30 and 60 respectively. The height of the tower is ?
The angles of elevation of the top of a verticle tower from two points, distance a and b (a > b) from the base and in the same straight line with it are complementary. Then the height of the tower is ?
At a point, 15 m away from the base of a 15 m high house, the angle of elevation of the top is :
A tower subtends an angle of 30 at a point on the same level as the foot of the tower. At a second point, h m above the first, the depression of the foot of the tower is 60 . The horizontal distance of the tower from the point is :
The angles of elevation of the top of a tower from the points P and Q, at distances of a and b respectively from the base of the tower and in the same straight line with it are complementary. The height of the tower is :
The top of a 15 m high tower makes an angle of elevation of 60 with the bottom of an electric pole and an angle of elevation of 30 with the top of the pole. What is the height of the electric pole?

Discussion

No Comment Found

Related MCQs

Reply to Comment