This is the task: Painting Triplets. Pania,Henare and Matui are triplets. Henare can paint a room by himself in 3 hours. His sister Pania can do it in 4 hours. Their brother Matui would take 6 hours on his own.
If they all work together and don't get in each others way, how long would the job take.
It was very hard. Mr Ladbrook helped me. This is our working out: