Q$1-$B$)$ A hi$-$volume air sampler clean filter weighs $10\mathrm{.}0g,$ and the dirty filter weighs $28\mathrm{.}3g.$ The initial and final air flows are $60$ and $40\frac{m^3}{m}in$ respectively. What volume of air went through the filter in $48hr?$ What was the particulate concentration in the air sample?

$[15$ Marks$]$