Observati emisiunile programate de un post de televiziune.
                              19.30:jocuri sportive
                              19.50:publicitate
                              20.00:jurnal de stiri
                              20.25:meteo
                              20.30:film artistic
                              21.45:publicitate
 Calculati durata emisiunii care ocupa in program:
a).cel mai putin timp;
b).cel mai mult timp;