UPSSSC PET 2023 (28 Oct Shift 2)
Directions
What is the total time taken to complete the work if all of them work together ?
Answer (Detailed Solution Below)View answer ▾Hide ▴
Answer: Option C — 80/29 days
Detailed Solution
One day's work of all five is ; with LCM 240 this is .
Total time is the reciprocal of one day's work, that is days (about 2.76 days); is the work per day, not the time.
Quick tip
Time together
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Ask a doubtMore Time & Work Questions
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Time & Work — UPSSSC PET Preparation
This question tests your understanding of Time & Work, a key topic in the UPSSSC PET Quantitative Aptitude section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
Time and work questions deal with how long one or more people, machines or pipes take to complete a task. The core idea is that if someone finishes a job in n days, they complete 1/n of the job each day. Questions involve people working together, joining or leaving partway, working on alternate days, efficiency comparisons, and wages shared in proportion to work done. Pipes and cisterns questions use the same logic and have their own page. The LCM method is the fastest approach for most questions. Take the total work as the LCM of the individual times, find each person's work per day, and the rest becomes simple division. This avoids messy fractions and makes problems with three or more workers much easier to handle. Practise the time and work questions below. Each solution shows the step-by-step working and the LCM shortcut where it helps.