Problem P. 4370. (October 2011)

P. 4370. A plane covers a distance of 2 km in 15 s when it flies downwind and in 20 s when it flies into the wind. Calculate the speed of the plane in km/h, and the speed of the wind.

(3 pont)

Deadline expired on November 10, 2011.

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

Megoldás. A repülőgép sebessége 420 km/h; a szélsebesség 60 km/h.

Statistics:

390 students sent a solution.
3 points:	328 students.
2 points:	34 students.
1 point:	11 students.
0 point:	3 students.
Unfair, not evaluated:	14 solutionss.

Problems in Physics of KöMaL, October 2011