close all;clear all;clc

T1=175;
T2=13;

t=0:0.1:10*T1;

h1=(1/T1)*exp(-t/T1);
h2=(1/T2)*exp(-t/T2);

g=impz(h1);
y=conv(g,h2);
plot(t,g,'linewidth',2);xlabel('time(ms)');y('impulse response of the first block')
figure;plot(linspace(1,175*10,length(y)),y,'linewidth',2);xlabel('time(ms)');y('impulse response of the system')