JEE-Mains 2015 (27/30)

Geometry Level 3

If the angles of elevation of the top of a tower from three collinear points \(A,B\) and \(C\), on a line leading to the foot of the tower, are \(30^{\circ},45^{\circ}\) and \(60^{\circ}\) respectively, then the ratio \(AB:BC\), is :

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