Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
Already signed up?
New to KöMaL?
I want the old design back!!! :-)

Problem P. 4214. (January 2010)

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 pont)

Deadline expired on February 10, 2010.

Sorry, the solution is available only in Hungarian. Google translation

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


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