Answer :
It will take Aaron 1.38 hours to travel 18 miles downstream as per time distance calculation.
What is time and distance calculation?
"To work out speed, divide the distance of the journey by the time it took to travel, so speed = distance divided by time. To calculate time, divide distance by speed. To get the distance, multiply speed by time.
You may see these equations simplified as s=d/t, where s is speed, d is distance, and t is time."
Given, speed of Aaron's boat is 9 miles per hour.
Speed of the river is 4 miles per hour.
Therefore, speed of Aaron's boat downstream is
= (9 + 4) miles per hour = 13 miles per hour.
Therefore, in order to travel 18 miles downstream Aaron will need
= [tex]\frac{18}{13}[/tex] hours = 1.38 hours.
Learn more about time and distance calculation here: https://brainly.com/question/23774048
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