It will take about 22.2 minutes to walk 1 mile at a rate of 2.7 miles per hour. This number can be arrived at using the "time formula" in math.
The time formula is a simple equation that people can use to estimate their travel time to any destination based on rate of travel and distance traveled. The formula is distance traveled divided by rate of speed to equal the length of time to travel that distance.
In this instance, the distance of 1 mile is divided by 2.7 miles per hour to equal .37, which is a part of an hour. Since there are 60 minutes in each hour, .37 is multiplied by 60 to arrive at 22.2 minutes.