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On walking 120 m towards a chimney in a ...

On walking 120 m towards a chimney in a horizonatal line through its base the angle of elevation of tip of the chimney changes from `30^@ " to " 45^@`. The height of the chimney is

A

120 m

B

`60(sqrt3-1)`

C

`60(sqrt3+1)`m

D

None of these

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The correct Answer is:
C
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