RRB NTPC · Question 53
It takes 12.5 minutes to completely fill a vessel with juice. However, kids are continuously drinking juice from the vessel at a rate which can empty the vessel in 25 minutes. At the current rate, how long will it take to completely fill the vessel?
Show answer & explanation
Answer: (C) 25 minutes
Explanation
Net filling rate = 1/12.5 − 1/25 = 2/25 − 1/25 = 1/25 of the vessel per minute, so it takes 25 minutes.