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| Math Central | Quandaries & Queries |
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Question from Cody: if a train travels 400 meters in 30 seconds how many kilometers per hr is it traveling |
Ho Cody,
One kilometer is 1000 meters so
\[\mbox{400 meters is } \frac{400}{1000} \mbox{ kilometers.}\]
One hour is 60 minutes and one minute is 60 seconds so one hour is $60 \times 60$ seconds or
\[\mbox{one second is} \frac{1}{60 \times 60} \mbox{ hours.}\]
Hence the train travels
\[\frac{400}{1000} \mbox{ kilometers in }30 \times \frac{1}{60 \times 60} \mbox{ hours.}\]
How far does it travel in one hour?
Penny
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