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time taken by particle to cross any side = t
speed = d/t (d is length of side)
t = 25/15 ..............1
now when particle moves from AB,BC,CD then it reaches to adjecent vertex D of square ...
total time taken = T = 3t =3(25/15) = 5sec
now average velocity = total displacement/total time
displacement BW initial poiny A & D is 25m so
average velocity = 25/5 = 5m/s
option d is correct
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