1 . How long would it take for both pipes to fill the swimming pool together, if a white pipe would take 9 hours to fill a large swimming pool full of water and a blue pipe 12 hours to fill the same swimming pool full of water?

2. It takes Jack 5 hours and Joan 10 hours to paint a shed. How long will it take them to finish the job if they work together?

with explanation po sana.​