Answer:
39 km/hr (rounded)
Step-by-step explanation:
use the equation speed=distance/time
3hrs 45mins = 3 3/4 hours or 15/4 hours
average speed = 145km/15/4 = 145 x 4/15 = 29 x 4/3 = 38.67 km/h
m/s = 5/18 km/h
38.67 x 5/18 = 10.74 m/s
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