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A person standing on the bank of a r...

A person standing on the bank of a river observes that the angle of elevation of top of a tree on the opposite bank of the river is `60^@` and when the retires 40 metres away from the tree the angle of elevation becomes `30^@` the breadth of the river is

A

40 m

B

30m

C

20m

D

60m

Text Solution

Verified by Experts

The correct Answer is:
C
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