C. Navetisti

Petru realizeaza de ce sunt atatia oameni in metrou: pentru ca la statia la care s-a urcat (Eroilor) este corespondenta cu linia care vine de la Gara de Nord. Isi aduce aminte atunci de ce i-a povestit de curand Miruna, pentru ca ea face naveta din Ploiesti. Ea pleaca intotdeauna din Bucuresti spre casa cu trenul care ajunge in Ploiesti la ora 19. Sotul sau o asteapta in statie si o conduce acasa cu masina. Insa intr-una din zile a luat trenul anterior, care a ajuns in Ploiesti la ora 18, insa nu l-a anuntat pe sot si a plecat in plimbare spre casa. Undeva pe drum si-a intalnit sotul, care venise sa o ia ca in fiecare zi la ora stabilita (19). S-a urcat in masina si au mers impreuna spre casa, unde au ajuns cu 20 de minute mai devreme decat de obicei. Cat timp a mers pe jos Miruna?

Sursa: adaptare (Ruxandra F. Olimid, dupa o problema de T.DeFranco si C.Vinsonhaler)

 

C. Commuters

Peter realizes why there are so many people in the underground: because at the station he got in (Eroilor) is connection to the line that comes from the Gara de Nord (central station in Bucharest).  He remembers why Miruna recently told him, because she is commuting from Ploiesti. She always goes back home with the train that arrives in Ploiesti at 7 p.m. Her husband waits for her at the train station and takes her home by car. But one day she took the previous train, which arrived in Ploiesti at 6 p.m. She did not announce the husband and started to walk home. Somewhere on her way home, she met her husband, who had come to take her like every day, at the scheduled time (7 p.m). He got into the car, and they drove home together, where they arrived 20 minutes earlier than usual. How much time did Miruna spend walking?

Source: adaptation (Ruxandra F. Olimid, after a problem of T.DeFranco si C.Vinsonhaler)

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vioman99

Se presupune ca sotul pleaca de acasa cu masina asa incat sa fie la gara la ora 19 pt a-si astepta sotia?


ruxandra

Da, sotul pleaca la timp de acasa pentru a fi la gara la ora obisnuita (19).


szabozoltan

Presupun ca in problema este vorba de traficul fluent al Bucuresti-ului, unde masinile nu stau la un semafor la o coada 45 de minute...