Q 3040434313.     A person standing on the bank of a river observes that the angle of elevation of the top of a tree standing on the opposite bank is `60^{\circ}.` when he moves `40m` away from the bank, he finds the angle of elevation to be `30^{\circ}`. Find the width of the river. `(\sqrt3 = 1.73)`

A

`60`

B

`40`

C

`20`

D

None of these

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