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

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

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