2A+3B=5C+D

The given reaction takes place in the gas phase in the PFR reactor. 10% A, 40% B and 50% inert are fed into the reactor at 10 atm and 400 kelvin. The reaction is 1st order with respect to A and B. The feed rate of A is 10 mol/sec.(k=10moldm^3/mol.s)

a-Find the concentration of A and B and the reaction rate for 20% conversion.

b-Calculate the reactor volume for 40% conversion.

(please solve step by step)