if 8 people take an hour to complete a piece of work, then how long should 16 people will take to complete the same piece of work?	Choose the correct choice from the following answers.
A) 15 min  B) 30 min  C) 26 min  D) 28 min  E) 18 min

Rationale: if 8 people take an hour to complete a piece of work , then 16 people will take 8 * 60 / 16 = 30 mins to complete the same piece of work . answer : b
Answer: B