What was the truck's average speed during the 4 hour period? (Full problem inside...)?

A truck driver noticed that the mileage on the truck odometer was 72,927, which he recognized as a palindrome. A palindrome is a number that reads the same left to right as right to left. Four hours later that drive was surprised to find that the odometer showed another palindrome. What was the truck... show more A truck driver noticed that the mileage on the truck odometer was 72,927, which he recognized as a palindrome. A palindrome is a number that reads the same left to right as right to left.

Four hours later that drive was surprised to find that the odometer showed another palindrome. What was the truck driver's average speed during the four-hour period? Justify your response.

I have no idea how to even START this problem! Can someone help?
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