Problem P. 4391. (December 2011)
P. 4391. A dog is at a distance of 40 m from its owner. If they move towards each other then they meet after 10 seconds. If they move in the same direction, then the dog reaches the owner in 20 seconds. Find the speed of the dog and the owner. Suppose that their motion is uniform straight line motion.
(3 pont)
Deadline expired on 10 January 2012.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. A kutya sebessége 3 m/s, az emberé pedig 1 m/s.
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2 points:  13 students. 
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Unfair, not evaluated:  6 solutions. 
