Answer
Please see the figure attached for sketches (a) and (b).
Work Step by Step
(a) The vertical traces at times $t = 1,2,3$
These vertical traces tell us that at larger time $t$ the heat diffuses slowly through the bar than at earlier time.
(b) The vertical traces $x=c$ for $c = \pm 0.2, \pm 0.4$
The vertical traces tell us that as time goes by the temperature cools off more rapidly near the center than points farther from the center.
