Kyle C. answered 08/26/21
Columbia University BA in CS-Math with 6 Years Tutoring Experience
To find Doug's average speed in miles per hour, you need to find how many miles Doug traveled in 1 hour. Miles per hour is a unit of speed that measures how many miles can be traveled in 1 hour at that given speed. For example. if you drive in a car with an average speed of 60 miles per hour, then you will travel 60 miles in 1 hour, 120 miles in 2 hours, and so on.
In this problem, you know how far Doug rowed in 1/3 hour. Doug will row 3 times this distance in 1 hour. That should give you his average speed in miles per hour.
I hope this helps you understand the problem!