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The top of a 15 metre high tower makes...

The top of a 15 metre high tower makes an angle of elevation of `60^0` with the bottom of an electric pole and angle of elevation of `30^0` with the top of the pole. What is the height of the electric pole?
(a) 5 metres
(b) 8 metres
(c) 10 metres
(d) 12 metres
(e) None of these

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