CampusFin

If A completes a job in 20 minutes and B in 30 min if they do the same job together how much time will they take?

Review the verified answer and explanation for this PPSC Punjab Public Service Commission past-paper question on CampusFin.

If A completes a job in 20 minutes and B in 30 min if they do the same job together how much time will they take? Answer: 12

Step 1: Work done per minute • A’s rate = 120\frac{1}{20}201 job per minute • B’s rate = 130\frac{1}{30}301 job per minute • Combined rate = 1/20 + 1/30 = 3 + 2/60 = 5/60 = 1/12 Step 2: Total time to complete the job together If together they do 1/12 job per minute, then they will complete the job in: 12 minutes

Question context

This question is part of 📏 Arithmetic Aptitude within the broader 🧠 Aptitude Mastery subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.