A can do a job in 18 days and B in 9 days. Working together, how many days will they take?

  1. 13 days
  2. 6 days
  3. 8 days
  4. 9 days
Answer

B) 6 days

In one day they do tfrac118 + tfrac19 = tfrac27162 of the job, so time = tfrac16227 = 6 days.

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