Zookeeper left her hometown, driving on the highway at a constant speed. After a time, she passed a mile marker displaying a two digit number.
An hour later, she passed another marker displaying the same digits but in the reverse order.
Three hours later, she passed a third marker with the same two digits in the same order as the first marker, but this time separated by a new digit.
After 40 minutes, Zook passed a fourth marker, again with the same two digits in the same order and sandwiching a different digit between them.
What was the speed of Zook's car and what numbers were displayed on the four mile markers?
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