Max Speed of Waves in Cowboy's Milk Glass: Solving a Physics Problem

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Elliot
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Missing template because of originally being posted in another forum.
1. a cowboy walks at a pace of about two steps per second, holding a glass of diameter 10.0 cm that contains milk. the milk sloshes higher and higher in the glass until it eventually starts to spill over the top. determine the maximum speed of the waves in the milk.

2. I know the frequency will be 2 since the milk oscillates with each step that he takes, but no sure how to approach it from their. the equations I think are:
y(t) = A sin(kx + wt + Φ)
 
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It sounds like the wave travels from the leading lip of the glass to the other edge and back again in ½ second?