WBCS.LIVE practice question

If \frac{4}{5}{\mathrm{\th }} of cistern is filled in 1 minute, how much more time will be required to fill the rest of it?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 10 sec.
  2. 12 sec.
  3. 15 sec.
  4. 20 sec.

Correct answer and explanation

Correct answer: 15 sec.

Explanation: āœ… Correct Answer: C) 15 sec. šŸ“š Explanation: If 4/5 of the cistern is filled in 60 seconds, then 1/5 of the cistern represents one-fourth of that work. We divide the time taken by the number of units already filled. The calculation 60 seconds divided by 4 gives us 15 seconds. This is the amount of time required to fill the remaining 1/5 of the cistern.