From an inclined plane two particles A' and 'B' are projected with same speed at the same angle betta with the horizontal; particle 'A' down the inclined plane and particle 'B' up the inclined plane. The ratio of the times of flight of 'A' and 'B' is cot theta,where 'theta' is the angle at which B' is projected measured from inclined plane. Find the angle B.(1) 90^°(2)60(3) 30^° (4) 45^°

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