Answer :

about 5 minutes: 60/4=15 then 15*3=45 and so 45/9 is 5 about 5 minutes an application
 
[tex] \frac{3}{4}=75 \\ \\ \frac{75}{9}= \frac{x}{1} \\ \\ \frac{9x}{9}= \frac{75}{9} \\ \\ \frac{75}{9}=8.3 \\ \\ x=8.3 \\ [/tex]

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