Average speed=the slope.
Points: (0,0) and (2.34,16.34) since the position is dependent on the time.
Use the formula m=y2-y1/x2-x1 and sub in the points
M=16.34-0/2.34-0
M=16.34/2.34
M=6.98 or 7
I answered that in your last question refer to your answer in section 2
So that ice would not melts and it helps to keep grip for walking or driving