IOM 2016, Блиц — Задача 66

Olympiad of Metropolises, Moscow. Blitz Contest, September, 5 · 5 септември 2016 г.

Условие

Bando and Bandi were given the job to paint a wall.

Bando can finish the job by himself in 3 hours, while Bandi can finish by himself in 4 hours.

They started together at 12:00.

While doing the job, they had a quarrel.

They argued for 10 minutes and during that time no one was working.

After the quarrel, Bandi abandoned the job and Bando finished painting alone.

If Bando finished painting at 14:25, for how many minutes did they work together before the quarrel started?

Решение

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Оригинал в Архива: blitz.pdf