# Problem P. 4617. (March 2014)

**P. 4617.** A student went by bicycle to Saddle City from Frame Village. He planned to go with an average speed of 18 km/h. Because of the heavy traffic, in the first third of his journey his average speed was only 15 km/h.

*a*) What should his average speed be in the remaining part of his journey, if he is to arrive at the planned time?

*b*) What should his average speed be in the remaining time, if his speed was 15 km/h in the first one-third of the time of his journey?

(4 pont)

**Deadline expired on April 10, 2014.**

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

**Megoldásvázlat.** \(\displaystyle a)\) 20 km/h.

\(\displaystyle b)\) 19,5 km/h.

### Statistics:

127 students sent a solution. 4 points: 117 students. 3 points: 5 students. 2 points: 4 students. 1 point: 1 student.

Problems in Physics of KöMaL, March 2014