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A boat is moving away from an observatio...

A boat is moving away from an observation tower .It makes an angle of depression of `30^(@)` with an observer 's eye when at a distance of 50 metre from the tower . After 8 seconds ,the angle of depression becomes `60^(@)` .By as - suming that it is running in still water , the approximate speed of the boat is :

A

`( 45 00)/( sqrt3)`

B

`( 45 00 ( sqrt3 -1))/( sqrt3)`

C

`45 00 sqrt3`

D

` ( 4500 ( sqrt3 +1 ))/( sqrt3 )`

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The correct Answer is:
B
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