Math CentralQuandaries & Queries


Question from J:

If a fly flies at 15 feet per a second between two walls closing in upon themselves. Wall A is moving to the right at 3 feet a second and wall B is moving to the left at 15 feet a minute, how far will the fly fly before the walls touch?


You didn't tell us how far apart the walls are when the process starts. Certainly the answer depends on this distance.

Suppose the walls are $d$ feet apart when the process starts. At what rate is the distance between the walls changing? How long will it take for this distance to decrease to zero?


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