Q: Pipe A fills a tank in 6 hours, pipe B in 8 hours. Both open together? If a leak empties in 24 hours, net time with all three? Step 1: A rate = 1/6, B rate = 1/8 per hour. Step 2: Together: 1/6 + 1/8 = 7/24 per hour. Time = 24/7 = 3.43 hours. Step 3: With leak (-1/24): net = 7/24 - 1/24 = 6/24 = 1/4. Time = 4 hours.