In a constant volume batch reactor, a zero$-$order gas phase reaction A $->$ bB was

conducted under conditions of $70\%$ A and $30\%$ inert, resulting in an increase in total

pressure from $1$ atm to $1\mathrm{.}5$ atm over $2$ minutes. If the same reaction is carried out

in a constant pressure batch reactor under conditions of $3$ atm and $40\%$ inert, what

would be the volume change ratio $($V$/$V$0)$ over $3$ minutes?