Ihave two questions, explain in a step by step process.
1) a cargo plane flew to the maintenance facility and back. it took one hour less time to get there then it did to get back. the average speed on the trip there was 220 mph. the average speed on the way back was 200 mph. how many hours did the trip there take?
2) a submarine left hawaii two hours before an aircraft carrier. the vessels traveled in opposite directions. the aircraft carrier traveled at 25 mph for nine hours. after this time the vessels were 280 mi apart. find the submarines speed.