Problem:
Before Ashley started a three-hour drive, her car's odometer reading was , a palindrome. (A palindrome is a number that reads the same way from left to right as it does from right to left.) At her destination, the odometer reading was another palindrome. If Ashley never exceeded the speed limit of miles per hour, which of the following was her greatest possible average speed?
Answer Choices:
A.
B.
C.
D.
E.
Solution:
The next palindromes after are , and . The difference is too far to drive in three hours without exceeding the speed limit of miles per hour. Ashley could have driven miles during the three hours for an average speed of miles per hour.