Problem P. 4508. (February 2013)
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 pont)
Deadline expired on 11 March 2013.
Sorry, the solution is available only in Hungarian. Google translation
Megoldásvázlat. A teljes idő \(\displaystyle \frac{1}{21}\) részét, vagyis majdnem 5 százalékát.
Statistics:
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. 
