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A boy standing in the middle of a field, observes a flying bird in the north at an angle of elevation of `30^(@)` and after 2 minutes, he observes the same bird in the south at an angle of elevation of `60^(@)`. If the bird flies all along in a straight line at a height of `50sqrt(3)` m, then its speed in km/h is

A

3

B

9

C

6

D

4.5

Text Solution

Verified by Experts

The correct Answer is:
C
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