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If y(x,t)=(6.1mm)sin(kx+(505 rad/s)t+?) describes a wave traveling along a string, how much time does any given...

If y(x,t)=(6.1mm)sin(kx+(505 rad/s)t+?) describes a wave traveling along a string, how much time does any given point on the string take to move between displacements y=-2.0 mm and y =+2.0mm?
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