Two pipes can fill an empty tank in 10 and 15 hrs. respectively. If waste pipe C is opened both A and B together can fill the tank in 5 hours. The waste pipe can empty the full tank in:
Q1. Two pipes can fill an empty tank in 10 and 15 hrs. respectively. If waste pipe C is opened both A and B together can fill the tank in 5 hours. The waste pipe can empty the full tank in:
Answer: 30 hrs.
Explanation: A and B together fill 1/10+1/15 = 1/6 per hour; with waste pipe open net rate = 1/5; waste pipe drains 1/5−1/6.