timing question

Hi I am new to the sport of triathlon and completed my first race yeasterday a sprint race which I loved. I am confused about how the timing works though as my friend crossed the finish line about 10 seconds befiore me but our chip times say i completed the triathlon 2 minutes faster overall. I know I was faster in the sprint and cycle etc but surely if she gets to the finish line before me she should be ahead overall?? I know this probaly sounds like a very basic question to many more experinced people any help getting my head around the times would be great.

Thank you,

dublingirl