A boat is moving away from an observation tower. It makes an angle of depression of 60 with an observer's eye when at a distance of 50 m from the tower. After 8 sec, the angle of depression becomes 30 . By assuming that it is running in still water, the approximate speed of the boat is

A boat is moving away from an observation tower. It makes an angle of

1.	A boat is moving away from an observation tower. It makes an angle of depression of 60 with an observer's eye when at a distance of 50 m from the tower. After 8 sec, the angle of depression becomes 30 . By assuming that it is running in still water, the approximate speed of the boat is
A.	45 km/h
B.	50 km/h
C.	33 km/h
D.	42 km/h
Answer» B. 50 km/h

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A boat is moving away from an observation tower. It makes an angle of depression of 60 with an observer's eye when at a distance of 50 m from the tower. After 8 sec, the angle of depression becomes 30 . By assuming that it is running in still water, the approximate speed of the boat is

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