Mike's father works two-part time jobs, one in the morning and one in the afternoon, and works a total of 42 hours each 6-day workweek. If his schedule is the same each day, and he works 4 hours each morning, how many hours does Mike's father work each afternoon?

Two farmers pay a total rent of $140 for a pasture. the first farmer placed $4 oxen in the pasture, and the second farmer placed $30 sheep in the pasture. the farmers split the rent based on the proportion of the pasture eaten by their own animals that month. how much should the first farmer pay, if 1 ox eats as much as 10 sheep in a month?