Answer: The Air force plane fly 150 miles before the cargo plane caught up.
Explanation:
Since we have given that
Average speed of Air force = 150 mph
Average speed of Cargo = 180 mph
They both flew in the same direction, So,
Relative speed = 180-150 =30 mph
Number of hours = 5 hours
So, Distance would be

Hence, the Air force plane fly 150 miles before the cargo plane caught up.