When the moving sidewalk at the airport is broken, as it oftenseems to be, it ta

Question

When the moving sidewalk at the airport is broken, as it oftenseems to be, it takes you 50 s to walk from your gate to baggageclaim. When it is working and you stand on the movingsidewalk the entire way, without walking, it takes 75 s to travelthe same distance. How long will it take you to travel fromthe gate to baggage claim if you walk while riding on the movingsidewalk.

I don't know which formula to apply to this question. Theformulas from section 4.4 dont seem to work. I could bemissing something, Pleas help

Explanation / Answer

vwalk = s / 50 vesc = s / 75 vwalk+esc = s / 50 + s / 75 = s /t    where t is the time to walk on the movingescalator Then t = 50 * 75 / (50 + 75) = 30 sec

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