SOLUTION: A 1-km long army is in marching order at constant velocity. A corporal from rear end travels towards the head and back at once to the rear at the constant speed, meanwhile the army

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Question 1084285: A 1-km long army is in marching order at constant velocity. A corporal from rear end travels towards the head and back at once to the rear at the constant speed, meanwhile the army has gone 1-km distance. The distance traveled by the corporal is.?
Answer by ikleyn(52858) About Me  (Show Source):
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Answer. 2 (two) kilometers.


For solution and similar problems, see the lesson
    - Travel problem on a messenger moving back and forth along the marching army's column
in this site.

The simplest solution is to use the moving coordinate system attached to the marching column. Then the solution and the answer become obvious.


Also, you have this free of charge online textbook in ALGEBRA-I in this site
    ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook under the section "Word problems", the topic "Travel and Distance problems".