A boy goes to buy books from a shop which is situated 5 km away from his house. He returns to his home after buying the books. Distance traveled by the boy is _______km, and displacement is ________ km.

The physical distance travelled by a moving person is the actual length of the path travelled by the moving person in a given interval of time. 

So the boy goes to the shop covering 5 km and travels again to the house covering another 5 km. 

So the total length of the path covered by the boy is 10 km which is the distance travelled by the boy. 

Displacement is the shortest distance between the starting point and the ending point of the complete travel. 

So the displacement of the boy is 0 km because the starting point and ending point of the boy are the same.
 

Therefore, the distance travelled by the boy is 10 km and the displacement is 0 km