Lina can sweep a room in 5 minutes. Ella can sweep the same room in 6 minutes. If both of them work together, what fraction of the house will they sweep in a minute?

Answer 1

LIna's workrate is 1/5 <--- she can sweep 1/5 of the room per minute

Ella's workrate is 1/6 <--- she can sweep 1/6 of the room per minute

working together 1/5 + 1/6 = 11/30

they can sweep 11/30 of the room per minute