Q81-b

A disk has $8$ equidistant tracks. The diameters of the innermost and outermost tracks are $1$ cm and $8$ cm respectively. The innermost track has a storage capacity of $10$ MB. If the disk has $20$ sectors per track and is currently at the end of the $5^{th}$ sector of the inner-most track and the head can move at a speed of $10$ meters/sec and it is rotating at constant angular velocity of $6000$ RPM, how much time will it take to read $1$ MB contiguous data starting from the sector $4$ of the outer-most track?