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# Answer to Question #382 in Statistics and Probability for Tiffany

Question #382
Two persons agreed to meet at a certain place between 2 PM and 3 PM. Each person has to wait another one for 10 minutes and then leave. What is the probability of their meeting if everyone can arrive whenever during this hour?
1
2010-07-07T05:55:17-0400
Let&rsquo;s set a coordinate system XOY, the axis X corresponds to the arrival time of person A, the axis Y &ndash; for the arrival time of person B.

The whole data set is a square with the side 1 (1 hour), and the set of &quot;favorable&quot; outcome is a hexagon inside this square, bounded by the lines |x&ndash;y|&le;1/6 (10 minutes = 1/6 of an hour). It&rsquo;s easier to calculate the square of this hexagon as the difference between the whole square and two triangles: 1*1 - 2*(1/2)*(5/6)*(5/6) = 11/36.

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