x_{5} = \operatorname{piecewise}(0, t < k_{1}, \operatorname{piecewise}(\frac{1}{10}, \operatorname{and}\left(t \ge k_{1}, t < k_{2}\right), \frac{13}{250}))\\
x_{6} = \operatorname{piecewise}(0, t < k_{2}, \frac{6}{125})