349.7miles per day.
The formula for calculating the speed traveled is expressed as:
[tex]Speed=\frac{distance}{time}[/tex]Given the following parameters
Distance traveled = 2448miles
Time to complete trip = 7 days
Substitute
[tex]\begin{gathered} Speed=\frac{2448miles}{7days} \\ Speed=349.7miles\text{/day} \end{gathered}[/tex]This shows that they must have traveled about 349.7miles per day.