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Un silo à grains est vidé en déduira la aligne.
dans un camion à raison de
e quatre tonnes par minute. Ini-
tialement, ce silo contenait
12 tonnes et 800 kg de grains.
• Pendant quel intervalle de
temps, à la seconde près, res-
tera-t-il entre 4 et 8 tonnes de
grains dans le silo