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A person standing on the bank of a river...

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^(@)`. When he moves 40 meter away from the bank, he finds the angle of elevation to be `30^(@)`. Find the height of the tree and width of the river
`" [take", sqrt(3)=1.732]`

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The correct Answer is:
20 meter
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