To calculate the distance traveled, you can use the formula:
\[ \text{Distance} = \text{Speed} \times \text{Time} \]
In this case, the speed is 60 miles per hour and the time is 7 hours. Plugging in the values:
\[ \text{Distance} = 60 , \text{miles per hour} \times 7 , \text{hours} = 420 , \text{miles} \]
So, the distance between the two cities is 420 miles.