Question 1204079
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The interval between 7:54 and 8:06 is 12 minutes long.<br>
With the described schedule, there are trains in the station from 7:55 to 7:56, from 8:00 to 8:01, and from 8:05 to 8:06.  So in the 12-minute interval from 7:54 to 8:06, there are trains in the station for 3 minutes.<br>
The probability that there is a train in the station at any instant between 7:54 and 8:06 is then 3/12 = 1/4.<br>
ANSWER: 1/4 or 25%<br>