'Truth is the sought for its own sake and those who are engaged upon the quest for anything for its own sake are not interested in other thing finding the truth id difficult and the road to it is rough "This was stated by which key figure in the development of scientific method in the 11th century?
A man walks 2 km towards North. Then he turns to East and walks 10 km. After this he truns to North and walks 3 km. Again he truns towards East and walks 2 km. How far is he from the starting point?