n average of $8$ cars reach the Oando petrol station every $10$ minutes, and an average of $10$ cars are served every $12$ minutes. Calculate:$($i$).$ The prob. That the petrol station is busy at any time $($traffic intensity$)($ii$)$ The average number of cars in the petrol station $($system$)$ at any given hour.$($iii$)$ The average time a given car spends in the petrol station $($system$).$Hint: l$=48$ and m $=50($work these out yourself$)$