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Justin requires 5 hours to paint a certain room. Suzanne requires 3 hours to paint the same room. If Justin and Suzanne work together, how long will it take them to paint 1⁄3 of the room?
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and then a manipulation of the result. If the
two people, working independently, need five hours and three hours to paint
the room, then, working together, they'd need 
hours
to complete the entire room. But since we're concerned with the time they'd
need to complete only 
of the room, we can
say that they'd need 
.