To find the rate (or speed) of an object you use the equation
Rate = Distance x Time or
d = rt So, just fill in the equation with the first set of numbers.
64 = r(1.7) Then divide.
r ≈ 37.65
Then, find the second speed.
d = rt
80 = r(1.9) And divide.
r ≈ 42. 11
Since you need to find the average speed just find the average of the two speeds. So
(42.11 + 37.65) / 2
79.76 / 2
39.88
So the average speed of the train was about 39.9 miles per hour.