15.3333
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15 kilometers per hour
Total distance = 75 km time = 3 hours average speed = 75km/3hrs = 25 km/hr
Average acceleration = (change in speed) divided by (time for the change) =(15 - 0) / (5) = 15/5 =3 meters per second2
800 miles/15 hours = about 53 miles per hour, to the justified number of significant digits.