Math

At the​ airport, Person A and Person B are walking at the same speed to catch their​ flight, but Person B decides to step onto the moving​ sidewalk, while Person A continues to walk on the stationary sidewalk. If the sidewalk moves at 1 meter per​ second, and it takes Person B 40

seconds less to walk the 480
​-meter
​distance, at what speed are Person A and Person B​ walking?

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  1. If A's speed is a, then B's speed is a+1

    since time = distance/speed,

    480/(a+1) = 480/a - 40
    a = 3 m/s

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