Question $3(0\mathrm{.}66$ points$)$

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You and your roommate are deciding how to share cleaning tasks. You can wash $6$ windows in an hour or vacuum $6$ rooms in an hour. Your roommate can wash $10$ windows in an hour or vacuum $6$ rooms in an hour. In order to most efficiently use your hour of cleaning time, should clean windows and should vacuum rooms.

a$)$ both of you; both of you

b$)$ your roommate; both of you

c$)$ you; your roommate

d$)$ your roommate; you