Question

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, Katalin can paint a certain room in 3 hours. Lena can paint the same room in 8 hours. Identify the 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?

Answer 1

Answer Choices:

Answer 2

It's the last one because:

K's rate is 1/3 (R)oom/(H)our and

L's rate is 1/8 (R)oom/(H)our

If we let "x" be the time:

[1/3 (R)oom/(H)our] times "x" (H)ours + [1/8 (R)oom/(H)our] times "x" (H)ours

= 1 room

Answer 3

"Hours" cancels on the left

Answer 4

"x" comes out to be 24/11 which is 2.18

Answer 5

thx!