search
Q: Two pipes P and Q can fill an empty tank in 20 min and 10 min respectively. R can empty a full tank in 15 minutes. If all three pipes are opened together, how much time (in minutes) will they take to fill the tank?
  • A. 12 minute
  • B. 18 minute
  • C. 10 minute
  • D. 15 minute
Correct Answer: Option A -
answer image

Explanations:

explanation image