Question 1122097
D=40+85(3)+60(2), since the pace is constant (presumably constant for each part, not the whole thing).



The domain is [0, 6]  This is the duration of the 6 hour trip.
The range is [0. 415]  This is the possible miles traveled during any time in the domain.
The assumptions are constant speed for the entire hour for the first, three hours for the middle, and 2 hours for the end.  It is possible to do so, but it would be difficult.

Use inequalities for the following (mine weren't supported)
Between 0 and 1 hour, distance is 40t. (t measured in hours)
Between 1 and 4 hours, distance is 40+85(t-1)
From 4 to 6 hours, distance is 295+60(t-4)