\left\{ \begin{array} { l } { 15 kr t = 1 } \\ { 12 ( k + 9 ) ( t - 2 ) r = 1 } \\ { 20 ( k - 5 ) ( t + 2 ) r = 1 } \end{array} \right.
Solve for k, r, t
r=\frac{1}{1260}\approx 0.000793651
t=7
k=12
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