Pay attention to the time bar!

Probability Level 3

During a soccer match there is a time bar that shows the time in minute and seconds.It is of the form ab:cdab:cd where abab shows the minutes for example 0505 and cdcd shows the seconds for example 4545.Thus the time would be 05:4505:45.The soccer match lasts 9090 minutes and it is divided into two halfs each of 4545 minutes.

How many times does it happen during the match that the time bar is of the form:ab:baab:ba for some positive integers aa and bb including 00?

Assume there wasn't any extra time at the end of each half.
The match lasts from 00:00 00:00 to 90:00 90:00.


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