C$($t$)=$ C$(0)/(1+3*$t$)$

where C$($t$)$ is the concentration of the drug and t is time in hours, while C$(0)$ is the initial drug concentration in the blood. $$

Patient has $7$ Liters of blood and the drug pump is able to deliver once per hour. $$If the desired maximum concentration of the drug in the blood stream is $2$ micro$-$grams $/$ Liter, what should the delivery rate of the pump be$?$Please enter your answer in micro$-$grams $/$ hour as a number with one decimal digit.