A can do a job in 12 days and B in 24 days. Working together, how many days will they take?

  1. 12 days
  2. 18 days
  3. 10 days
  4. 8 days
Answer

D) 8 days

In one day they do tfrac112 + tfrac124 = tfrac36288 of the job, so time = tfrac28836 = 8 days.

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