Question 1029847
Okay, one way to find the total distance between them is to look at how much distance each girl travels and add them together...remember that distance = rate times time...
For Doreen, she covers a distance of (9.9)(4) = 39.6 miles.
For Irena, her speed is 11 miles per hour (found in a separate calculation, Doreen = 9.9 = .9(Irena)), so that
Irena covers (11)(4) = 44 miles
Thus the total distance between them is
39.6 + 44 = 83.6 miles.