Not enough information to answer. This depends on many variables i.e. type and size of machine, length of grass fitness off operator.
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Tractor 1 mows 25/4 acres per hour, tractor 2 mows 25/5 acres per hour, ie between them they can mow 6¼ + 5, 11¼ acres per hour so 25 acres will take 25/11¼ ie 2 and 7/9 hours.
Exactly 0.459 acres.
Seven
50
31,000,000 acres.