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please answer this question
if don't know you don't have to keep you don't know
please don't keep irrelevant answers
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average speed = distance/ time
= 40+30 km/ 2.78 h
= 70/2.78 km/h
= 70/2.8 × 18/5 m/s
== 90.65 m/s
average velocity= displacement/ time
= √(30²+40²) / 2.78 km/h
= 50/2.78 × 18/5 m/s
= 64.75 m/s