Brishti went on an 8-hour trip in a car. Before the trip, the car had travelled a total of X km till then, where X is a whole number and is palindromic, i.e., X remains unchanged when its digits are reversed. At the end of the trip, the car had travelled a total of 26862 km till then, this number again being palindromic. If Brishti never drove at more than 110km/h , then the greatest possible average speed at which she drove during the trip, in km/h, was