What is the null hypothesis and alternative hypothesis?

A bus company advertised a mean time of 150 minutes for a trip between two cities. A consumer group had reason to believe that the mean time was more than 150 minutes. A sample of 40 trips showed a mean x= 153 minutes and a standard deviation s=7.5 minutes. At the .01 level of significance, test the consumer group's belief. one - tailed Ho: 1 2 150 Ha