Calculating the probability using mean and standard deviation.

The weights of medium oranges packaged by an orchard are normally distributed with a mean of 14 ounces and a standard deviation of 2 ounces.  The weights of large oranges are normally distributed with a mean of 18 ounces and a standard deviation of 3 ounces.  If we select, at random, one each of the medium and large oranges, determine the probability the medium orange weighs more than the large.