I did part 1 but need help with part 2

(Part 1) a food delivery service located at the edge of town and is responsible for serving a university. Testing different routes for getting from its location to campus, a driver finds that five trips using route A take an average of 5.9 minutes, with a standard deviation of 1.4 minutes; six trips using route B take an average of 4.2 minutes, with a standard deviation of 1.8 minutes. Assuming normal populations with equal standard deviations, and using the 0.10 level, is there a significant difference between the two routes?

(Part 2) Given the information given in part 1, and using a 0.05 level of significance, were we justified in assuming that the population standard deviations were equal?