Answer:
18
Step-by-step explanation:
You first need to know how much miles it takes on the trail. Then you look 20 x 3 is one hour. And if the 3 group said it takes 2 hours waking for them its like this, the first group takes one hour to go thru the trail, but the second group takes and hour and half the 3 group takes 2 hours.
I wish this helps. :)
Let x be the number of square feet to be mowed
215 square feet take 22 minutes
x square feet take 12 minutes
Y = x + 4
Slope = 1
Y-intercept = 4