Question 67435
First, we know the formula d = v x t, thus t = d/v.
The driving time from the Jones' house to Disneyland will equal d / 50 with d as the distance between their house and Disneyland.
Similarly, the driving time from Disneyland back to their house is d / 40.
According to the problem, we also know that the total time for driving to Disneyland and back is 7.2 hours.
Therefore, we can set up an equation with d being the unknown as follows:
              (d/50) + (d/40) = 7.2
Multiplying both sides by 200, we get: 4d + 5d = 1440     
                          Simplifying:    9d   = 1440 
     Dividing both sides by 9, we get:     d   = 160
So the distance to Disneyland is 160 miles.