Mr. Y started from his house, walked 4kms towards North, then 6kms towards West and finally 12kms towards South and stopped. The shortest distance between his house and the point he stopped is:
10 kms
Suppose Mr. Y started from his house A. He walked 4 kms towards North and reached B. At B, he walked 6 kms towards West and reached C. At C, he walked 12 kms towards South and reached D.
ED = CD – CE = CD – AB