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P. 4508. The average speed of the tourists when they walk from the shelter house to the hilltop was 1.5 km/h, whilst on the way back it was 3.5  km/h. The average speed for the whole distance from the shelter house back to the shelter house was 2 km/h. What fraction of the total time of the excursion did the tourist spend on the hilltop having a rest?

(3 points)

Deadline expired on 11 March 2013.

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

Megoldásvázlat. A teljes idő $\displaystyle \frac{1}{21}$ részét, vagyis majdnem 5 százalékát.

Statistics on problem P. 4508.
 164 students sent a solution. 3 points: 140 students. 2 points: 2 students. 1 point: 9 students. 0 point: 11 students. Unfair, not evaluated: 2 solutions.

• Problems in Physics of KöMaL, February 2013

•  Támogatóink: Morgan Stanley