$5\mathrm{.}2$ Let's consider a $14,000-$RPM disk that has an average seek time of $7\mathrm{.}3ms.$ The transfer rate of the disk is $2\mathrm{.}5G\frac{b}{sec}($i$.$e$.$ Gbit per second$)$; the controller overhead is $0\mathrm{.}4ms.$ How long $($measured in $ms)$ does it take to transfer a $64-$MB data block from the disk into the main memory?

$214\mathrm{.}64$