A man holds four balls 180 m above the ground and drops them at regular intervals of time so that when the first ball hits ground, fourth ball is just leaving his hand. At this time the second and third balls from the ground are at the positions.

Question

a)160 m and 100 m

b)80 m and 20 m

c)20 m and 80 m

d)100 m and 160 m