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

A person standing on the bank of a river observes that the angle subte

1.	A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 60 . When he retires 40 m from the bank, he finds the angle to be 30 . The breadth of the river is :
A.	40 m
B.	60 m
C.	20 m
D.	30 m
Answer» D. 30 m

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

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