please help.

A batch reactor is to be operated adiabatically to process an exothermic, first order reaction, AB at constant density with no inerts added. Species B is not present at the start and the following data is applicable: What is the total batch time to reach a conversion of X=0.2 ? (Hint: think about numerical integration between different values of X ) [13 marks] Explain qualitatively how you would design a cooling system for the reactor in part (b) in order to carry out the reaction isothermally at 400K