John can wash the family car in one hour. His sister can wash it in 45 minutes. How long will it take them if they work together?

Painters Ali and Jason, working together, can paint a house in 12 hours. If Jason works twice as fast as Ali, how long would it take Ali to do the job alone?

Rhoda can paint a room in 4 hours. sam can paint the same room in 5 hours. Rhoda and Sam worked together for one hour the sam finished the remaining part of the work alone, how long did take sam to finish the remaining part part?

Jasmine uses a garden hose to fill her pool. It takes Jasmine 16 hours for the pool to fill completely. Unfortunately, Jasmine does not know there is a crack in her pool siding that can deplete a full pool in 24 hours. Starting with an empty pool, how many hours will it take Jasmine to fill the pool while the crack is still leaking?