An outlet pipe can empty 2/3 of a cistern in 20 minutes. In 8 minutes, what part of the cistern will be emptied?	Choose the correct choice from the following choices: A) 1 / 2 B) 1 / 3 C) 2 / 9 D) 4 / 15 E) 9 / 20

Rationale: "8 / 20 * 2 / 3 = 4 / 15 the answer is d ."
Answer: D