A fill pipe can fill 2/3 of cistern in 40 minutes in how many minutes, it can fill full of the cistern? Choose the correct choice from the following options:
A) 60 min
B) 36 min
C) 25 min
D) 30 min
E) 50 min

Rationale: 2 / 3 of the cistern can fill in 40 min 3 / 3 of the cistern can fill in = 40 * 3 / 2 * 3 / 3 = 60 min answer is a
Answer: A