The time for an automated system in a warehouse to

The time for an automated system in a warehouse to locate a part is normally distributed with a mean of 45 seconds and a standard deviation of 30 seconds. Suppose that independent requests are made for 10 parts.
(a) What is the probability that the average time to locate 10 parts exceeds 60 seconds?
(b) What is the probability that the total time to locate 10 parts exceeds 600 seconds?