Airplanes A and B are flying with constant velocity in the same vertical plane at angles 30 0 and 60 0 with respect to the horizontal respectively as shown in the figure. The speed of A is 100 
ms -1 . At time t = t 0 s, an observer in A finds B at a distance of 500 m. This observer sees B moving with a constant velocity perpendicular to the line of motion of A. If at t = t0, A just escapes being hit by B, t 0 in seconds is
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(5)The relative velocity of B with respect to A is perpendicular to line of motion of A.
And time t 0 = (Relative distance) / (Relative velocity)
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