Question

Sally can paint a room in 4 hours while it takes Steve 8 hours to paint the same room. How long would it take them to paint the room if they worked together?

Answer 1

Sally paints a room in 4 hours, so in 1 hour she paints 1/4 of a room.

Steve paints a room in 8 hours, so in 1 hour she paints 1/8 of a room.

So,

1 hour -----> 1/4 + 1/8 of a room

x hour -----> 1 of a room