Q:

Pipes A and B together can fill a tank in 16 hours, whereas pipe C alone can empty the full tank in 24 hours. A and B were opened together for 10 hours and then closed. Pipe C was then opened. The tank will now be emptied by C in:

• 1
  18 hours
• 2
  14 hours
• 3
  16 hours
• 4
  15 hours