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Sagot :

Bonsoir,

Environ 110 mettent 10mn

190 mettent 20mn

80 mettent 30mn

60 mettent 40 mn

110*10 + 190*20 + 80*30 + 60* 40 =

1100 +3800 + 2400 + 2400=9700

110+ 190 + 80 + 60 = 440

9700 / 440 => 22

En moyenne, environ 22 mn

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