Answer:
C.4180 ft/min
Explanation:
Hello, I think I can help you with this
Step 1
convert 258 miles into feet using a rule of three, the equivalence is
1 mile = 5280
Now, if
1 mile ⇒ 5280 ft
285 miles ⇒x
the relation is

Step 2
convert 6 hours into minutes using a rule of three, the equivalence is
1 hour = 60 min
Now, if
1 hour ⇒ 60 min
6 hours ⇒x min
the relation is

the time he was traveling is 360 min
Step 3
the velocity is the relation between the distance and the time
the distance he traveled is

C.4180 ft/min
Have a nice day.