Explanation


Explanatory Answer

If they are 2C/5 apart they have either covered C/2-2C/5 = C/10 together, then they will be 2C/5 distance apart after 4 minutes and after every 40K + 4 minutes.

If they met and travelled 2C/5 distance away from each other, they will be 2C/5 distance apart after 20 + 16 minutes = 36 minutes or after every 40K + 36 minutes.

If they met and travelled 3C/5 distance away from each other, they will be 2C/5 distance apart after 20 + 24 minutes = 44 minutes or after every 40K + 44 minutes.

So, 68 is not a possible value of t.

 

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