math

I have a math question for my cell biology class. A molecule exchanges places with its neighbor every 10^-7 seconds. It will diffuse from one end of a 2 micrometer cell to the other in 1second. Ok now I have a 6M x 6M room filled with 4cm ping pong balls. I have to determine the rate of speed they are moving and how long it will take to move from one end of the room to the other. I have no idea how to set this up.

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  1. sorry need to clarify. It is just the floor of the 6mx6m room covered with the ping pong balls

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