Answer:
70
Step-by-step explanation:
By exterior angle theorem:

Average speed = total distances / total time
3115.8 / 7.2 = 432.75 mi/h
Given:

Let's evaluate and find the quotient.
We have:

SInce it is not a repeating decimal, we are asked to leave to answer as it is.
A repeating decimal is a decimal with digits or group of digits that repeats endlessly.
The decimal 5.937
ANSWER:
5.9375