proporcjonalność odwrotna
10 * 2⅓h = 7x
23 ⅓ h = 7x
x = 70/3 h * 1/7
x=3 ⅓h = 3h20min
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proporcjonalność odwrotna
10 * 2⅓h = 7x
23 ⅓ h = 7x
x = 70/3 h * 1/7
x=3 ⅓h = 3h20min