Answer:
14.1 miles
Explanation:
If Mr Veensta walked 3 TIMES as far as Mr Cartee, then certainly the miles Mr Cartee walked should be multiplied by three; as in the following:
Mr Cartee = 2.1 *(3) + 1.7*(3) + 0.9*(3) = 14.1 (THE MILES MR VEENSTA WALKED!!)
Hoped I helped! ^^