i need a website that would teach me every thing about elapsed time. it's really kind of confusing to me

somebody answer this question, i really need help!

go on gooogle and type in elapsed time in math. And check: Math:Elapsed Time-eThemes

um any other websites

Do u want to calculate elapse time?

i need help

12h 55min 9s + 8h 25min 25s

1:40pm to 8:55pm

45

find each elapsed time. 1. 9:P.M. TO 10:45 P.M.

find each elapsed time 1. 9:59P.M. TO 10:45 P.M.