Q 3020012811.     A person standing on the bank of a river observes that angle of elevation of the top of a tree on the opposite bank of the river is `60^{0}` and when he retires `40m` away from the tree the angle of elevation becomes `30^{0}`. The breadth of the river is

A

`40m`

B

`30m`

C

`20 m`

D

`60 m`

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