请老师们帮我解这几道简单的题，不明白

mataoturku

1. if M and N are positive integers that have remanders of 1 and 3, respectively, when divided by  which of the following could not be a possible value of M + N (86, 52, 34, 28)

2. A bus trip of 450 miles would have taken 1 hours less if the average speed S for the trip had been greater by 5 miles per hour, what was the average speds in miles per hour. ( 10, 40, 45, 50 , 55)

3. rectangular box, length 28 inches, height 2 inches and width 8 inches

The fingure above shoes the dimensions of a rectangular box that is to be completely wrapped with paper, if a single sheet of paper is to be used without patching, the dimensions of the paper could be ( 17 in by 25 in,,, 21in by 25in,,,24in by 12in)

xiexie