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A hedgehog wishes to cross a road withou...

A hedgehog wishes to cross a road without being runover. He observer the angle of elevation of a lamp post on the other side of the road to be `45^(@)` from the edge of the road and `30^(@)` from a point 10m back from the road. How wide is the road?

A

13.90 m

B

`10/(sqrt(3))m`

C

`10/(sqrt(3)-1)m`

D

13.66 m

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