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From an aeroplane just over a straight road, the angles of depression of two consecutive kilometer stones situated at opposite sides of the aeroplane were found to be `60^@` and `30^@` respectively. The height (in km) of the aeroplene from the road at that instant, is:
एक विमान से ठीक सीधी सड़क पर, विमान की विपरीत दिशाओं में स्थित दो अनुक्रमिक किलोमीटर पत्थरों के अवनमन कोण क्रमशः `60^@` और `30^@` हैं। उस समय विमान की सड़क से ऊँचाई (किमी में) कितनी है?

A

A)`sqrt3/4`

B

B)`sqrt3`

C

C)`sqrt3/2`

D

D)`sqrt3/3`

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