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As observed from the top of a lighthouse, `120 sqrt3` m above the sea level, the angle of depression of a ship sailing towards it from `30^@` to `60^@`.The distance travelled by the ship during the period of observation is :
एक प्रकाशस्तंभ के शीर्ष से जो की, समुद्र तल से `120 sqrt3` मीटर ऊपर है, उसकी और आ रहे जहाज का अवनमन कोण `30^@` से `60^@` हो जाता है अवलोकन की अवधि के दौरान जहाज द्वारा तय की जाने वाली दूरी ज्ञात कीजिये

A

240 m

B

240 `sqrt3 m`

C

180 `sqrt3`m

D

180 m

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