(II) A horse canters away from its trainer in a straight line,
moving 116 $\mathrm{m}$ away in 14.0 $\mathrm{s}$ . It then turns abruptly and
gallops halfway back in 4.8 $\mathrm{s}$ . Calculate $(a)$ its average speed
and (b) its average velocity for the entire trip, using "away
from the trainer" as the positive direction.