8 h = 480 min
15 h = 900 min
480 + 10x = 900 - 60x
10x + 60x = 900 - 480
70x = 420
x = 6
480 + 10 * 6 = 540 [min] = 9 [h]
Hania zadała pytanie o 9:00
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8 h = 480 min
15 h = 900 min
480 + 10x = 900 - 60x
10x + 60x = 900 - 480
70x = 420
x = 6
480 + 10 * 6 = 540 [min] = 9 [h]
Hania zadała pytanie o 9:00