GCSE Maths Practice: inverse-proportion

\( \begin{array}{l} \text{It takes 6 workers 15 hours to complete a task.} \\ \text{How long would it take 10 workers?} \end{array} \)

Choose one option:

\( \text{9 hours} \) \( \text{10 hours} \) \( \text{8 hours} \) \( \text{6 hours} \)