Discussion
A can do a piece of work in 10 days and B can do it in 15 days. In how many days will they finish the work together?
Answer: B
Work in rates: someone who finishes a job in \( n \) days does \( \tfrac{1}{n} \) of it a day, and rates add.
\[ \frac{1}{10} + \frac{1}{15} = \frac{3 + 2}{30} = \frac{1}{6} \]
\[ t = 6 \text{ days} \]
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