According to the rules laid out in the description, 3 riders would be required. The first rider starts at station 1 and rides the 6 miles to station 2. This rider then attempts to ride the 43 miles to station 3, but never makes it, since that is station x. The second rider would then travel the 43 miles from station 3 to station 2, rescuing the first rider along the way. After arriving at station 2, the second rider rides the 43 miles back to station 3, for a total of 86 miles. There are still 38 miles to the final station, which would exceed the 100 mile limit for the second rider, so then a third rider would carry the mail bag to the final station.

Will you give any context to your comment?

Will you explain in details what you thnk is wrong, and why you think it is wrong?

Remember, 76 people already solved this so...

So how did 1100+ people solve it?