Question 1123871
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<pre>
Time for the secondary wave from the source to the station is  {{{d/275}}} minutes, where d is the distance from the source to the station.


Time for the primary wave from the source to the station is  {{{d/(1.7*275)}}} minutes, where d is the same distance from the source to the station.


Your equation is


{{{d/275}}} - {{{d/(1.7*275)}}} = 5.07 minutes   (the "time difference" equation).


From the equation


d = {{{5.07/(1/275 - 1/(1.7*275))}}} = (at this point I use Excel spreadsheet in my computer) = 3386 kilometers.


<U>Answer</U>.  The distance from the source to the station is 3386 kilometers.
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Solved.