Quizz time V Cookies Factory
A Cookies Factory has old machine. it can finish producing Cookies kuota in 25 hour. Then production manager bought new machine that can finish same kuota in 15 hour. the manager decided to use them both. at 7 am both machine work to produce the same quota. after a while the old machine broken, so the new machine finish it alone until 8 pm. Question : what time the old machine broken?