Let X be a continuous random variable whose cumulative distribution function…

Let X be a continuous random variable whose cumulative distribution function (CDF) FX(x), for some t, is given as follows: $F_X(x)=\begin{cases}0&x\leq t\\\frac{x-t}{4-t}&t\leq x\leq 4\\1&x\geq4\end{cases}$. If the median of X is 3, then what is the value of t?