Discussion
If a man can cover 12 metres in one second, how many kilometres can he cover in 3 hours 45 minutes?
Answer: B
Convert the time to seconds and multiply.
\[ 3 \text{ h } 45 \text{ min} = 3.75 \times 3600 = 13{,}500 \text{ s} \]
\[ d = 12 \times 13{,}500 = 162{,}000 \text{ m} = 162 \text{ km} \]
Equivalently, 12 m/s is \( 12 \times \tfrac{18}{5} = 43.2 \) kmph, and \( 43.2 \times 3.75 = 162 \).
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