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 metres away from the tree, the angle of elevation becomes $30^\circ$ . The breadth of the river is

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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 metres away from the tree, the angle of elevation becomes  $30^\circ$ . The breadth of the river is

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The correct option is (B) : 20 m

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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 metres away from the tree, the angle of elevation becomes \(30^\circ\). The breadth of the river is

The Correct Option is B

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