$(15$ pts$)$ An oxygen transfer test was performed to determine efficiency of the aeration of

a diffused aerator at $8C.$ The results of the test are shown in the $LnY$ versus Time plot

below, where $Y$ is the deficit ratio. Calculate the time required to increase the bulk liquid

oxygen concentration from $2m\frac{g}{L}$ to $8m\frac{g}{L}$ with the mentioned aerator at $20C.$ Note that

$($temperature coefficient$)$ is $1\mathrm{.}024.$