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If the angles of elevation of the top of a water from three collinear points, B and C, on a line leading to the foot of the tower, are `30^@,` `45^@` and `60^@` respectively, then the ratio, AB:BC,is:

A

`sqrt3:sqrt2`

B

`1:sqrt3`

C

2:3

D

`sqrt3:1`

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