An Air Force plane left Rome seven hours before a cargo plane. The planes flew in opposite directions. The cargo plane flew at 350 mph for two hours. After this time the planes were 4480 mi. apart. What was the Air Force plane's speed?
The air force plan flies 4480 mi - 350 m/hr * 2 hr = 3780 miles in 9 hours
3780 m /9 hr = .......... m/hr