A can do a job in 6 days and B in 12 days. Working together, how many days will they take?

  1. 5 days
  2. 4 days
  3. 6 days
  4. 9 days
Answer

B) 4 days

In one day they do tfrac16 + tfrac112 = tfrac1872 of the job, so time = tfrac7218 = 4 days.

Quantitative Reasoning MCQ · More Speed, Time, Work & Ages MCQs · Practise