3.

A and B are standing at a distance of 20 km

from each other on a straight East-West road.

A and B start walking simultaneously eastwards

and westwards respectively and both

cover a distance of 5 km. Then A turns to his

left and walks 10 km. B turns to his right and

walks 10 km at the same speed. Then both

turn to their left and cover a distance of 5 km

at the same speed. What will be the distance

between them ?