A fill pipe can fill 1/2 of cistern in 35 minutes. In how many minutes, it can fill 1/2 of the cistern?  Choose the correct choice from the following answers:
A) 20 min B) 25 min C) 30 min D) 35 min E) 40 min
Required time = 35*2*1/2 = 20 minutes   Answer is 35 min
<result>D</result>
A fill pipe can fill 1/2 of cistern in 35 minutes. In how many minutes, it can fill 1/2 of the cistern?