time format problem for sports result analysis

hi all ! I just completed my registration to ask for your help. I'm sure it will be easy for you but I can't figure it out. 2012-09-08 Olympique Esprit mtl.xlsx

if you open attached .xlsx file you will see I imported triathlon results and made 4 graphs

1st graph shows overall time plotted vs overall position (every data point is aligned)
2nd graph shows swim time plotted vs overall position (scattered, understandable because a faster swimmer doesn't necessarily equals great overall time)
3rd graph shows bike time plotted vs overall position (idem)
4th graph shows running time plotted vs overall position (idem)

Actually the data is sorted by overall position (which is fine). But the problem I'm having is that the time format for some athletes is messed up. For example see position 5, 14 and 37 bike split times. Because the majority of triathles have a bike time of more than 1 hour. But these 3 managed to finish under 1h. When I plot the dots, Excel think it's 59h (when it's actually minutes). If you look at the swim (nage) and running (course à pied) graphs, you can see these irregularities also with times splits that are out of the ordinary.

If you could fix that, and tell me how to manage this in my future analysis

thx all !