Question

Riley can paint a bedroom in 8 hours. Rickey can paint the same bedroom in 5 hours. How long would it take them if they worked together?

Answer 1

i believe when you combine rates it means that 1/8+1/5 which is equal to 13/40 room per hour
mean that you can finish 13 rooms in 40 hours
what about one bedroom ?so it will be 40/13 which is about 3 hours