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,A, B, and CC, on a line leading to the foot of the tower, are 30,45,30^{\circ},45^{\circ}, and 60,60^{\circ}, respectively, then the ratio AB:BCAB:BC is __________.\text{\_\_\_\_\_\_\_\_\_\_}.

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