SOF IMO · Problem Solving · Quiz
5 real SOF IMO questions on Problem Solving. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.
Question 1 of 5
HARDA tank can be filled by two pipes A and B in 12 hours and 18 hours respectively. A third pipe C can empty the full tank in 9 hours. If all three pipes are opened together when the tank is empty, how long will it take to fill the tank completely?