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Q)

A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is $60^{\circ}$ and when he retires $40$ meter away from the tree the angle of elevation becomes $30^{\circ}$. The breadth of the river is


( A ) 30 m
( B ) 60 m
( C ) 40 m
( D ) 20 m

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