O
A group of college students is volunteering for Help the Homeless during their
spring break. They are putting the finishing touches on a house they built.
Working alone, Irina can paint a certain room in 8 hours. Paulo can paint the
same room in 7 hours. Write an equation that can be used to find how long it
will take them working together to paint the room. How many hours will it take
them to paint the room? If necessary, round your answer to the nearest
hundredth.
(1 point)
88
7.
-x
1; 15 hours
111
7.5 hours
+= 1; 3.73
즉
즉=1:1
5 hours
1; 1.87 hours
Which one is it?