I'm sorry to say that I only know number 1. Number one is 3 hours, only because if you need a total of 440 miles and you traveled 275 miles so far (which is 5hrs because 275 divided by 55 is 5). So you subtract those numbers (440 - 275) giving you 165. So to find out how many more hours you need, you divide 165 divided by 55 giving you 3hrs more to complete the destination.
