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GMAT Work-rate problems simplify when you assume total work equals 1 unit and convert times to rates. Example: For a task, A needs 5 minutes and B needs 10. Combined rate = 1/5 + 1/10 = 3/10 per minute. Time to finish together = 1/(3/10) = 10/3 minutes.
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Work and time problems are among the most classic types of questions tested on aptitude exams, including the GMAT. They look simple on the surface, yet they require a structured approach if you want to solve them quickly and with confidence. One of the most effective strategies for these questions , during your GMAT prep, is to assume the total work to be a single unit and then calculate the fraction of work completed by each individual in a given time. By doing this, you can easily combine the efforts of multiple workers and determine how long they will take together.
Work and time questions often appear straightforward, but their beauty lies in the clarity of logic they demand.
A standard example is:
A takes 10 minutes to do a job. B takes 30 minutes to do the same. How long will it take to complete the job if both work together?
At first glance, this may look like a problem from school mathematics, but on the GMAT, such questions test your ability to apply structured reasoning under time pressure.
The most effective way to solve these questions is to assume that the total work is equal to 1 unit. From there:
Now, if they take k minutes to finish the work together, then:
k × (1/10 + 1/30) = 1
The sum inside the bracket gives (1/10 + 1/30) = 4/30 = 2/15. Substituting back:
k × (2/15) = 1
k = 15/2 = 7.5
Therefore, A and B together can complete the work in 7.5 minutes.
This method is not only simple but also reliable and efficient. By breaking down the problem into smaller fractions of work and combining them, you avoid confusion and ensure accuracy. More importantly, once you master this, you can apply the same approach to tougher variations where three people work together, where one person leaves midway, or where different rates of work are involved. This principle is a cornerstone of GMAT work and rate problems, and practicing it on GMAT exercises and GMAT mocks will build both your speed and accuracy.
Assuming total work as one reminds us to see effort as a unified purpose. Each minute adds a fraction; clarity turns scattered activity into progress. In GMAT preparation, define one learning unit per session, contribute measurable parts, and let joint study or mentorship raise your combined rate. In the business school application, align essays, recommendations, resume, and interviews as parts of one story so evaluators see steady, coherent work, not isolated pieces. In life, choose a clear whole worth finishing, then add honest fractions each day. Ask for help when it increases the combined rate. Unity of purpose transforms time into results!
