A renowned chemistry student names Bubba timed how long it would take
him to complete 4 chemistry problems of varying difficulty. The first
problem was fairly difficult and took him 103.9 seconds. The second one was
extremely easy and only too him 1.37 seconds. The third problem was a real
brain buster and required him to call his good friend Ernest on the phone for
help. When he finally got the help he needed for this difficult problem it
took him 3999 seconds. The last problem he remembered copying into his
notes took him only 14.278 seconds. Since all four numbers were recorded
at different degrees of accuracy, Bubba now needs your help to add these
numbers together and round to the proper number of sig figs.