Grogu and Groot decide to enter a hot wing eating contest. Grogu can demolish a platter of hot wings in 9 minutes and Groot can do the same in 12 minutes. Working together, how many minutes will it take them to eat a platter of hot wings?

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score