Suppose we use a $6-$disk RAID$4$ system where each disk can read a random block in $20ms.$ Suppose the

first data disk dies. While in degraded mode before the disk is replaced, what is the time in seconds to

read $2520$ random blocks, assuming no caching, no filesystem overheads, no xor overheads, and that

the blocks are evenly spread across the RAID system? Express your answer in seconds rounded to $3$

decimal places. For example, $10\mathrm{.}1234$ seconds would be rounded as $10\mathrm{.}123$ and $10\mathrm{.}1235$ would be

rounded as $10\mathrm{.}124.$