change in expanded forms​

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

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

Can someone me with this? i’m not sure what to put for my equations.