Question

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

• A. 40 m
• B. 20 m
• C. 30 m
• D. 60 m

Answer 1

Answer: (B)

20 m

Answer 2

The correct option is (B) : 20 m