2002 Math OSK, Number 12

Bando and Bandi wants to paint the fence. Bando can finish painting the fence by himself in 3 hours, while Bandi can finish it in 4 hours. In 12:00, they start to paint the fence together. But at a certain time, they start fighting. They fought for 10 minutes and in that moment, both of them didn't paint the fence. After the fight, Bandi leaves and Bando finished painting the fence alone. If Bando finished painting the fence at 14:25, at what time did the fight occur? (State your answer in 24 hours time span. If the time is at o'clock state it as an integer, e.g.: 15:00 -> 15. If the answer is not at o'clock, state it as a decimal, e.g.: 15.30 -> 15,5)