A person standing on the bank of a river observes that the angle subtended by a tree on the oppo...

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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 \( 60^{\circ} \), when he retires 40 metres from the bank he finds the angle to be \( 30^{\circ} \). Then, the breadth of the river is
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