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draw a diagram. It is clear that
tanθ = x/25
so
sec^2θ dθ/dt = 1/25 dx/dt
1.0353 dθ/dt = 0.04 * 1.5
dθ/dt = .057 rad/s
dθ/dt is constant, and since there are 2π radians in one revolution, the period is 2π/.057 = 110 seconds
Better check my math; 2 minutes/rev seems like a long time