Time and Work
Build every time-and-work problem from one complete work unit, a consistent time unit, and the worker's one-day or one-hour rate.
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8 bilingual articles
Time and Work Basics: Whole Work and One-Day Rate
Build every time-and-work problem from one complete work unit, a consistent time unit, and the worker's one-day or one-hour rate.
Open article →Two Workers Together: Combined Work Rate
Add two one-day work rates, simplify the fraction and invert the result to find how long both workers take together.
Open article →Missing Worker, Joining and Leaving Problems
Recover an unknown worker's rate and solve changing-team questions by tracking the work completed in each time stage.
Open article →Efficiency and Inverse Time Ratio
Translate efficiency comparisons and percentage changes into inverse completion-time ratios before combining worker rates.
Open article →Workers, Days, Hours and Work Output
Connect workers or machines, days, daily hours and work quantity with one compound-variation equation and correct units.
Open article →Three Workers and Pairwise Work Rates
Combine three workers, decode pairwise team times and recover individual rates with a structured rate equation method.
Open article →Pipes and Tanks as Positive and Negative Work
Treat filling as positive work and emptying as negative work, then calculate the tank's net rate and completion time.
Open article →Sharing Wages by Work Contribution
Divide total wages according to each person's actual work contribution, using rate, working time and inverse completion-time ratios.
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