A man starts from point ‘O’, travels 20 km towards East to reach point ‘A’, turns right and travels 10 km to reach point ‘B’, turns right and travels 9 km to reach point ‘C’, turns right and travels 5 km to reach point ‘D’. Turns left and travels 12 km to reach point ‘E’ and then turns right and travels 6 km to reach point ‘F’.
What is the shortest distance between his initial and final points?
1
\(\sqrt {20}\)
2
\(\sqrt {145}\)
3
\(\sqrt 2\)
4
13