You and your family are taking a road trip. You start off traveling 130 miles in two hours. You stop for half an hour to gas up and get snacks. Back on the road for 3.5 hours and you have travelled 225 more miles. So far, what is the average speed of the trip in miles/ hour?

64.642

Explanation:

To find the miles per hour of each trip, you would divide the miles by the amount of time, in hours, driven. So that leaves you with the first trip being 65 miles per hour on average, and the second trip being about 64.285.

Then, to find the average for both stops, or the entire trip, you would add those two numbers together (65 and 64.285), divide by two (because that's the total number of numbers in the series), and you'd get 64.64!

Finding the Average:

To find the average of a series of numbers, simply add them all together and then divide by the amount of numbers there are.