Answer:
75 miles per hour
Explanation:
In order to find the answer, you have to use the formula to calculate the speed:
s=d/t
s=speed
d=distance traveled= 900 miles
t=time elapsed= 12 hours
Now, you can replace the values in the formula:
s=900 miles/ 12 hours
s=75 miles per hour
According to this, the answer is that the average speed during the trip was 75 miles per hour.