1.

A person standing on an open ground hears the sound of a jet aeroplane coming from north at an angle 60∘ with ground level. But he finds the aeroplane right vertically above his position. If v is the speed of sound, then speed of the plane is

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A person standing on an open ground hears the sound of a jet aeroplane coming from north at an angle 60 with ground level. But he finds the aeroplane right vertically above his position. If v is the speed of sound, then speed of the plane is



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