David's family drove 330 miles in 6 hours to reach the Grand Canyon before nightfall. If they drove at a constant rate, how many miles per hour was David's family driving?

they would have to be driving at a steady 55 miles per hour to make it there in 6 hours

explanation:

you would divide 330 by 6 to get how many hours per hour

330 / 6 = 55

hope this helps :)