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### Question Asked by a Student from EXXAMM.com Team

** Q 3010212119. ** 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)`