The first spacecraft flew for 30 minutes, or 30/60=1/2 hour.
The second spacecraft flew for 30+30=<<30+30=60>>60 minutes, or 1 hour.
Thus the first spacecraft traveled at a speed of 448 miles in 1/2 hour, or 448/(1/2)=896 miles per hour.
The second spacecraft traveled 448 miles in 1 hour, or 448/1=<<448/1=448>>448 miles per hour.
The difference in speed, in miles per hour, between the two spacecraft was 896-448=<<896-448=448>>448 miles per hour.
#### 448