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Answer:
100 miles
Step-by-step explanation:
We know this because,
lets say they start at 0
0+the first 15 is 15
15+23=38
then when they backtrack 2 miles
you subtract 2
38-2=36
so they have gone 36 miles so far.
to get the amount of miles they have to go you can subtract.
136-36=100
So that is how I got 100.
pls mark brainliest