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p - "ilość" pracy do wykonania
p/5v = 4 h 40 min = 4 2/3 h = 14/3 h
5v = p/14/3 h |* (7/5)
7v = p/(14/3 * 5/7 h) = p/(10/3 h)
10/3 h = 3 1/3 h = 3 h 20 min
jak masz pytania to pisz na pw