College Physics (7th Edition)

(a) Average speed of insect is $0.027\,\mathrm{m/s}$. (b) Magnitude of average velocity of insect is $0.019\,\mathrm{m/s}$.
(a) Distance traveled by the insect, $x=27+21=48\,\mathrm{m}$. Time taken, $t=30\times 60=1800\,\mathrm{s}$. Average speed, $s=\frac{x}{t}=\frac{48}{1800}=0.027\,\mathrm{m/s}$. (b) Displacement of the insect, $d=\sqrt{27^2+21^2}=34.2\,\mathrm{m}$. Magnitude of average velocity, $v=\frac{d}{t}=\frac{34.2}{1800}=0.019\,\mathrm{m/s}$.