A man is watching 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 100 metres from the tower. After 10 seconds, the angle of depression becomes 30 . What is the approximate speed of the boat, assuming that it is running in still water?

A man is watching from the top of a tower a boat speeding away from th

1.	A man is watching 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 100 metres from the tower. After 10 seconds, the angle of depression becomes 30 . What is the approximate speed of the boat, assuming that it is running in still water?
A.	32.42 km/hr
B.	26.28 km/hr
C.	24.22 km/hr
D.	31.25 km/hr
Answer» C. 24.22 km/hr

Discussion

No Comment Found

Related MCQs

An aeroplane when flying at a height of 4000m from the ground passes vertically above another aeroplane at an instant when the angles of the elevation of the two planes from the same point on the group
At the foot of a mountain the elevation of its summit is 45 ; after ascending 1000 m towards the mountain up a slope of 30 inclination is found to be 60 . Find the height of the mountain.
There is a small island in middle of 100 m wide river and a tall tree stands on island. P and Q are points directly opposite to each other on two banks. If angles of elevation is 30 and 45 .
From a point on the ground 40 m away from the foot of a tower, the angle of elevation of the top of the tower is 30 . The angle of elevation of the top of a water tank (on the top of the tower) is 45
A tower is 100 3 metres high. Find the angle of elevation of its top from a point 100 metres away from its foot.
A man on cliff observes fishing trawler at angle of depression of 30 which is approaching the shore to point. 6 minutes later, the angle of depression of the trawler is found to be 60 .
A boat is being rowed away from a cliff 150m high. At the top of the cliff the angle of depression of the boat changes from 60 to 45 in 2 minutes. Find the speed of the boat.
The banks of a river are parallel. A swimmer starts from a point on one of the banks and swims in a straight line inclined to the bank at 45 and reaches the opposite bank at a point 20 m
If the angle of elevation of cloud from a point 200 m above a lake is 30 and the angle of depression of its reflection in the lake is 60 , then find the height of the cloud above the lake.
The heights of two poles are 80 m and 62.5 m. If the line joining their tops makes an angle of 45 with the horizontal, then find the distance between the poles.

Discussion

No Comment Found

Related MCQs

Reply to Comment