H=9144;//standard altitude of flying in metre
//from relation of altitude and Temperature:
T=228.81;//Temperature at Standard altitude of 9144 m
V=885.14*5/18; //velocity of jet transport
R=287;//gas constant for air,J/Kg.K
y=1.4;// specific heat ratio for air
a=(y*R*T)^0.5 //velocity of sound at that altitude