Answer:
a) Average speed = 200 Km/hr
b) Average velocity = 0 m/s
c) Total distance = 800 Km
d) Total displacement = 0 Km
Explanation:
a) Let the speed of the plane from Addis Ababa to Gamble be represented by 
, and from Gamble to Addis Ababa by 
.
Average speed = 
= 
= 
= 200 Km/hr
= = 
= 200 Km/hr
Average speed = 
= 200 Km/hr
b) Velocity = 
Average velocity = 
Since the plane flies from Addis Ababa to Gamble, then back to Addis Ababa, its total displacement is zero.
So that,
Average velocity = 0 m/s
c) Total distance = 400 Km + 400 Km
= 800 Km
d) Total displacement = 400 Km + (-400 Km)
= 0 Km
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