Question

A boy who is standing in the middle of a field watches a

Q: A boy who is standing in the middle of a field watches a bird flying in north direction at the angle

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bird flying in north direction at the angle of elevation of 60o and after 3 minutes watches the same bird in south direction at the angle of elevation of 30o if the bird in flying at a height of 60√3 m in a straight line, then speed of bird in km/hr?

A 4.8 km/hr

B 3.8 km/hr

C 2.7 km/hr

D 3.5 km/hr