Rate: Average Speed of Traveling Train from A to B

A train traveled 960 miles from Town A to Town B. What was the train's average speed during that journey?

1) If the train had traveled from Town A to Town B at an average speed that was 12 miles per hour slower, it would have taken 20 hours

2) If the train had traveled from Town A to Town B at an average speed that was 60 percent faster, it would have taken 6 fewer hours.