Question

A palindromic number is a number whose digits read the same left to right as right to left. For​ example, 383,​ 12,321, and​ 9,876,789 are palindromic. The odometer of the family car read​ 15,951 when the driver noticed that the number was palindromic.​ "Curious," said the driver to herself.​ "It will be a long time before that happens​ again." But 2 hours​ later, the odometer showed a new palindromic number. Assuming it was the next possible​ one, how fast was the car driving in those 2​ hours?

Answer 1

try 110 miles :) That would be 55 mph
The ones can not change, but the 9 can become 10