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A balloon leaves from a point P rises at...

A balloon leaves from a point P rises at a uniform speed. After 6 minutes, an observer situated at a distance of `450 sqrt3` metres from point P observes that angle of elevation of the balloon is `60^@`.Assume that point of observation and point P are on the same level. What is the speed (in m/s) of the balloon?
एक मुब्बारा एक समान गति से बिन्दु P से छोड़ा जाता है। 6 मिनट पश्चात, बिन्दु P से `450 sqrt3` मीटर दूरी पर एक समीक्षक है जो देखता है कि गुब्बारे का उन्नयन कोण `60^@` है। मान लीजिए कि समीक्षा बिन्दु तथा बिन्दु P एक ही स्तर पर है। गुब्बारे की गति [मी/ से.में] क्या है?

A

4.25

B

3.75

C

4.5

D

3.45

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