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How far does he travel?

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freddiew | 22:33 Wed 30th Sep 2009 | Quizzes & Puzzles
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I am looking for a starting point to help me solve this GFQ question - and for the answerbank police out there - I am NOT asking for the answer, but would like to know the formula to help me calculate the answer for myself.
Question reads - If a column of soldiers 4 miles long advances 4 miles while a motor cyclist rides from the rear to the front to deliver a message to an officer, and then returns to the rear - how far has he travelled?
Any HINTS and HELP would be appreciated - thanks!
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There are 3 points in time - when the rider starts off, when he reaches the front to deliver the messge, and when he gets back to the rear of the column. Consider what has happened to the rear and front of the column at each of those points in time.
When the advance is stopped how far will the head of the column have moved altogether? The driver won't need to return to where the end of the column was originally, but to its new position
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I assumed that the soldiers were still advancing while the rider was returning. If the soldiers have only advanced the 4 miles then stopped, then it is quite easy to work out.
Thanks for your help.
Haven't been on for a week. Been too busy catching up with the quiz as had no internet for ages.
There was a website that gave the question using one mile, so hopefully you had to multiiply by 4 for the answer. It was a completely strange formula that I ignored and it was a decimal figure.
Shan't get em all right anyway.

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