Q49

Consider a hard disk with a rotational speed of $15000$ rpm. The time to move the read/write head from a track to its adjacent track is $1$ millisecond. Initially, the head is on track $0$. The number of sectors per track is $400$. The sector size is $1024$ bytes. It is necessary to transfer data from $10$ randomly located sectors in each of the following tracks in the order: $5, 12$ and $7$. The total time for the data transfer (in milliseconds) from the hard disk is $\_\_\_\_\_\_\_$. (rounded off to one decimal place)