A fill pipe can fill 1/2 of cistern in 25 minutes. In how many minutes, it can fill 1/2 of the cistern?
Choose the correct choice from the following answers.
A) 10 min  B) 15 min  C) 20 min  D) 25 min  E) 30 min

Rationale: "required time = 25 * 2 * 1 / 2 = 25 minutes answer is d"
Answer: D