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Shortcut Tricks: Time and Work Video Lecture | CSAT Preparation - UPSC

FAQs on Shortcut Tricks: Time and Work Video Lecture - CSAT Preparation - UPSC

1. What is the formula to calculate work done in time and work problems?

Ans.The formula to calculate work done is: Work = Rate × Time. In time and work problems, if A can complete a work in 'a' days, then A's work rate is 1/a. To find the total work, you can use the formula: Total Work = (1/a + 1/b + 1/c) × Time, where A, B, and C are different workers.

2. How do you solve problems involving two or more workers?

Ans.To solve problems involving two or more workers, first determine the individual work rates of each worker. Then, sum their rates to find the combined work rate. Finally, use the formula Work = Rate × Time to find the time taken for them to complete the work together.

3. What are some common shortcuts to solve time and work problems quickly?

Ans.Common shortcuts include: 1. Finding the work rate (work done per day), 2. Using the concept of LCM (Least Common Multiple) to find the time taken by multiple workers, 3. Setting up equations that balance work done and time taken for various workers.

4. How can I approach time and work problems involving efficiency?

Ans.To approach time and work problems involving efficiency, determine the efficiency of each worker first (work done per day). Then, use the formula: Efficiency = Total Work / Total Time. This allows you to compare different workers' efficiencies and calculate how long it would take for them to complete the work together or individually.

5. What is the relationship between time, work, and number of workers in these problems?

Ans.The relationship is inversely proportional. If the number of workers increases, the time taken to complete the work decreases, assuming each worker works at the same rate. Conversely, if the number of workers decreases, the time taken increases. This relationship can be expressed as: Time1 × Workers1 = Time2 × Workers2.

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