Problem P. 3815. (September 2005)
P. 3815. A car travels at a speed of 12 km/h towards south for five minutes, then it turns toward east and moves at a speed of 25 m/s for 3 minutes, and finally it changes its velocity to 108 km/h and travels toward northeast for two minutes. Calculate the length of its displacement and the average speed.
(3 pont)
Deadline expired on October 11, 2005.
Statistics:
450 students sent a solution.  
3 points:  261 students. 
2 points:  98 students. 
1 point:  65 students. 
0 point:  19 students. 
Unfair, not evaluated:  7 solutions. 
