attached is a statistic question Please go into detail on how you got the answer

A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 54:0 minutes. Find the probability that a given class period runs between 51.5 and 51.75 minutes. Find the probability of selecting a class that runs between 51.5 and 51.75 minutes. (Round to three decimal places as needed.)