To find the distance traveled by the riverboat, we can use the formula:
distance = speed × time
where speed is in miles per hour and time is in hours.
Given that the riverboat traveled at a speed of 2.5 miles per hour for 0.8 hours, we can substitute these values into the formula:
distance = 2.5 miles/hour × 0.8 hours
distance = 2 miles
Therefore, the riverboat traveled 2 miles.