Question

I am having a ton of trouble with this lab question, I do not understand it at all. The question is:
Show how the rate of reaction in reciprocal seconds was calculated for the mixture in question 1, using the class average.

The mixture in question one is:
3HSO3^- + IO3^- + 3H2O --> 3SO4^4- + I^- + 3H3O^+

the class average: average time is 19s, 1/time is 0.053, and the rate is 0.000630

Thats all the information I have to work with, however I do not understand what the question is asking me.

Please help!