From his home, Tony would have to walk 2 kilometers north to get to his friend Martha's
house and 4 kilometers east to get to his friend Lucy's house. One day, Tony walked from his
home to Lucy's house. Together, Lucy and Tony cut directly through the field that separated
them from Martha's house. When they finished playing at Martha's, Tony walked back home.
In all, how far did Tony walk? If necessary, round to the nearest tenth.
kilometers