A can do a job in 20 days and B in 30 days. Working together, how many days will they take?

  1. 10 days
  2. 25 days
  3. 12 days
  4. 14 days
Answer

C) 12 days

In one day they do tfrac120 + tfrac130 = tfrac50600 of the job, so time = tfrac60050 = 12 days.

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