I hate these question that involve part A and B part A I get but part B not so sure?

Data was collected outside a popular new restaurant to determine the mean waiting time to be seated at a table. Assume the data was normally distributed with a mean of 45 min and standard deviation of 12 min

determine the probability that a randomly selected person has to wait less than 20 min

So for this questionI would use:

normalcdf(0,20,45,12)

= 0.0185219157

on to part B

determine the probability that a randomly selected person has to wait more than 1 h?

they have to wait more than an hour

so I cant use the normalCDF thing

confused?