Discussion
A 600 meter long train crosses a signal post in 40 seconds. How long will it take to cross a 3 kilometer long bridge, at the same speed?
Answer: A
A signal post is a point, so the first crossing gives the speed.
\[ v = \frac{600}{40} = 15 \text{ m/s} \]
\[ t = \frac{600 + 3000}{15} = \frac{3600}{15} = 240 \text{ s} = 4 \text{ minutes} \]
The data are complete, so "data inadequate" is a trap; the 3 km must be converted to 3000 m.
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