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P. 4214. A freight train, undergoing uniform motion, passes the semaphore next to the rails in 4 seconds. Then it passes a 40-m long train, which moves with the same speed as the freight train but into the opposite direction, also in 4 seconds. What is the speed of the freight train in km/h?

(3 points)

Deadline expired on 10 February 2010.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. A vonat hossza 40 m, sebessége 36 km/h.

Statistics on problem P. 4214.
175 students sent a solution.
3 points:134 students.
2 points:14 students.
1 point:14 students.
0 point:10 students.
Unfair, not evaluated:3 solutions.

  • Problems in Physics of KöMaL, January 2010

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