A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60^{\circ}. When he retires 40 {\m} from the bank, he finds the angle to be 30^{\circ}. What is the breadth of the river?

UPSC NDA II 2013 Mathematics Paper

Question : 119 of 120

Marks: +1, -0

A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60∘. When he retires 40m from the bank, he finds the angle to be 30∘. What is the breadth of the river?

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