A train left for London and 9 hours later a car traveling 83 mph tried catching up to the train. After 5 hours the car caught up. What was the train's average speed?

Delbert keeps track of total of the total number of points he earns on homework assignments, each of which is worth 60 points. at the end of the semester he has 810 points. write an equation for delbert’s average homework score a in terms of the number of assignments n.