two people started simultaneously from points A and B towards each other.at the moment the person who started from A had covered two -third of the way,the other person had covered 2 km less than half the total distance,if it is known that when the person who started from B had coverd 1/4 of the way,the other person was 3 km short of the mid point, find the distance b/w A&B.the speed of the two people were constan