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Answer: S = 850 km/h = 235.11 m/s
Explanation:
average speed = total distance : total time elapsed
distance = 3400 km
total time = 4 hours
average speed = D : T = 3400 km : 4 h = 850 km/h
[ 850 km /h = 850 000 m : 3600 s = 236.11 m/s ]