Discussion
What fraction of 3 hours is 24 seconds ?
Answer: C
24 seconds is \(\frac{1}{450}\) of 3 hours.
Convert both to seconds first:
\[ \begin{aligned} 3\ \text{hours} &= 3 \times 3600 = 10800\ \text{s} \\ \frac{24}{10800} &= \frac{1}{450} \end{aligned} \]
The distractors come from slips in the units: \(\frac{1}{150}\) is 24 seconds as a fraction of one hour, and \(\frac{1}{300}\) is 36 seconds of 3 hours.
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