ATQ, Let the time taken by Q to do the work be 'x' days. 
So, x = (225/2) = 112.5 So, Q alone can do the work in 112.5 days
How do you typically handle conflicts or disagreements with others?
How important is it for you to have a strong sense of identity or self-concept?
Are you a planner or a spontaneous person?
How do you typically handle unexpected changes or disruptions to your plans?
How do you balance your own needs and desires with those of others?
How do you deal with criticism or negative feedback?
How often do you find yourself worrying about the future or things you cannot control?
How important is it for you to feel a sense of purpose or meaning in your life?
Are you more of a leader or a follower?
How likely are you to try new things or explore new ideas?
