SOLUTION: It takes a student 8 hours to drive from her home back to college, a distance of 580 kilometers. Before lunch her average speed is 80 kilometers per hour and after lunch it is 6

Algebra ->  Equations -> SOLUTION: It takes a student 8 hours to drive from her home back to college, a distance of 580 kilometers. Before lunch her average speed is 80 kilometers per hour and after lunch it is 6      Log On


   

Question 923343: It takes a student 8 hours to drive from her home back
to college, a distance of 580 kilometers. Before lunch her
average speed is 80 kilometers per hour and after lunch
it is 60 kilometers per hour. How many hours does she
travel at each rate?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
t time at 80mph
80t + 60(8-t) = 580km
20t = 100
t = 5hr, time at 80mph. 3hr at 60mph 8-5