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You could do x=81 with the little line on the top (represents the number going on forever, and example is 0.818181818181818181818181818818181818 etc.)
We're going to "cut" the repeating part here in a few steps. First, we're going to put the number in a variable:

Next, to get rid of the negative, we can multiply either side by -1 to get

Now, we won't actually use this -x directly; instead, we want to create two new values, one by multiplying either side by 10:

and the other by multiplying either side by 1000:

Next, we can get rid of the repeated part of the number by subtracting -10x from -1000x:

And finally, we can divide either side of the equation by -990 to find that

His average speed will be 75 miles per hour. Hope it help!
Answer:
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Step-by-step explanation:
⠀⠀⠀⠀⠀⠀⢀⣤⣀⣀⣀⠀⠻⣷⣄
⠀⠀⠀⠀⢀⣴⣿⣿⣿⡿⠋⠀⠀⠀⠹⣿⣦⡀
⠀⠀⢀⣴⣿⣿⣿⣿⣏⠀⠀⠀⠀⠀⠀⢹⣿⣧
⠀⠀⠙⢿⣿⡿⠋⠻⣿⣿⣦⡀⠀⠀⠀⢸⣿⣿⡆
⠀⠀⠀⠀⠉⠀⠀⠀⠈⠻⣿⣿⣦⡀⠀⢸⣿⣿⡇
⠀⠀⠀⠀⢀⣀⣄⡀⠀⠀⠈⠻⣿⣿⣶⣿⣿⣿⠁
⠀⠀⠀⣠⣿⣿⢿⣿⣶⣶⣶⣶⣾⣿⣿⣿⣿⡁
⢠⣶⣿⣿⠋⠀⠀⠉⠛⠿⠿⠿⠿⠿⠛⠻⣿⣿⣦⡀
⣿⣿⠟⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠻⣿⡿