The concept central to is to promote the flow of life energy throughout the body.

t'ai chi

Explanation:

T'ai chi is a Taoist-oriented internal Chinese (nei jia) martial art that combines ancient bodily exercises known as chi kung and tao yin that involve breathing, concentrating, and the precepts of traditional Chinese medicine. The central concept of T'ai chi is to promote the flow of life energy throughout the body.

The term T'ai chi can be translated as "supreme ridge hand combat technique" or "supreme ridge boxing".

The distance between them is changing at the speed of 10.16 m/hr

Explanation:

Consider the sketch attached below.

The question is simply asking to calculate the resultant of the two velocities.

To get the angle between them, we simply use the coordinates of the two vectors to determine the angle between them.  

90 + 45 = 135°

from the cosine rule we have

= + - 2abcosθ

= + - 2 ×6×5×cos 135

= 103.426

c =

c = 10.17 m/hr