Someone wants to grind 81 quarters of grain. In what shortest time can he grind the grain?
3.There were 300 buckets of water in the room. Two pumps began to pump out water. One pump pumps out 48 buckets in 2 hours, the other pumps out 129 buckets in 6 hours. How many hours will it take to pump out all the water if 8 buckets of water come from the ceiling every hour?
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