JEE Math Practice 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 $$40$$ meters away from the tree the angle of elevation becomes $${30^ \circ }$$. The breadth of the river is :
- A.$$60\,\,m$$
- B.$$30\,\,m$$
- C.$$40\,\,m$$
- D.$$20\,\,m$$
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