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Mathematics answers of the eighth grade in the whole primary school
Well, you just need to consider the time and distance you walk.

Time: when the correspondent takes the X test, the students take the x+ 18.

Distance: correspondent 14*x, student 5*(x+ 18). At the same time, when chasing, the correspondent and the student travel the same distance. Just solve the equation 14*x=5*(x+ 18).