Answer: There are 26000 miles that will both be due at the same time.
Explanation:
Since we have given that
Number of miles required by new vintage = 400
Number of miles if these services have must been performed by the dealer = 13000
We need to find the number of miles from now that will both be due at the same time.
We would use "LCM of 400 and 13000":
As we know that LCM of 400 and 13000 is 26000.
So, there are 26000 miles that will both be due at the same time.