Question
4 friends rented 3 computers from 3.20 p.m. to 3.40 p.m. and took turns to play games on them. At any time, 3 of them played on the computers while the other friend watched. If each of them had the same amount of playing time, how many minutes did each friend get?
2 m

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4 friends rented 3 computers from 3.20 p.m. to 3.40 p.m. and took turns to play games on them. At any time, 3 of them played on the computers while the other friend watched. If each of them had the same amount of playing time, how many minutes did each friend get?