A gaseous compound 'A' decomposes simultaneously into gaseous products 'B', 'C' and 'D' with the rat — Chemical Kinetics Chemistry Question

Question

A gaseous compound 'A' decomposes simultaneously into gaseous products 'B', 'C' and 'D' with the rate constants 2 × 10^-3 s^-1, 3 × 10^-3 s^-1 and 1.93 × 10^-3 s^-1, respectively. If only A(g) was present initially at a pressure of 13.86 atm and the reaction is performed at constant volume and temperature, the partial pressure (in atm) of B(g) in the reaction mixture after 100 s from the start of reaction is