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?

• A. 10 km
• B. 30 km
• C. 20 km
• D. 25 km