Answer
Average velocity $\approx$ 2.7 m/s due east
Average speed = 8.0 m/s
Work Step by Step
Let due east be the positive direction
Time = 5 $\times$ 60 = 300 s
Displacement = $x_{f}$ - $x_{0}$ = 800 - 0 = 800
Average velocity
= $\frac{displacement}{time}$
= $\frac{800}{300}$
$\approx$ +2.7 m/s (2.7 m/s due east)
Distance = 1600 + 800 = 2400 m
Average speed
= $\frac{distance}{time}$
= $\frac{2400}{300}$
= 8.0 m/s
