Problem $3(20$ points$)$

$4\mathrm{.}5.$ Compute and plot a diagram of way capacity and running productive capacity as functions of speed for an LRT system with two$-$vehicle trains operating under safety regime $b.$ Its characteristics are as follows: $C_v=174sp\frac{s}{v}eh,l^{\text{'}}=21\mathrm{.}50m,s_0=3m,t_r=1\mathrm{.}0s,b_n=0\mathrm{.}9\frac{m}{s^2},b_e=2\mathrm{.}8\frac{m}{s^2}.$