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x ----------------- 1
5/8x = 2,5 |:5/8
x = 4 [h]
x = 1
x = 2,5 * 8 / 5
x = 4h
Robert ma 4h wolnego czasu.
x na 8
....................
x=(2,5*8):5=20:5=4
Odp. Robert ma codziennie 4 godziny wolne.