Three different strata gases flow into the underground work at the following rate: gas A $0\mathrm{.}04$m$3/$s$,$ gas B $0\mathrm{.}0081$m$3/$s and gas C $0\mathrm{.}0055$m$3/$s$.$ The TLV value of gas A is $8$ppm$,$ gas B is $12$ppm while gas C is $11$ppm respectively. Calculate volume flow rate of air required to achieve the acceptable level condition underground.