For time, $t$, in hours, $0\le t\le1$, a bug is crawling at a velocity, $v$, in meters/hour given by $$v = \frac{2}{6 + t}.$$ Use $\Delta t = 0.2$ to estimate the distance that the bug crawls during this hour. Use left- and right-hand Riemann sums to find an overestimate and an underestimate. Then average the two to get a new estimate.

underestimate =
overestimate =
average =
(for each, include units)