FOR ONLY FIFO AND SSFT

The r$/$w head of a disk is at track $143.$ The previous position was track $0.$ Requests to access the following tracks have arrived:

$143,86,1470,913,1774,948,1509,1022,1750,130$

$($a$)$ In which order will the tracks be visited using:

FIFO

SSTF

$($b$)$ Starting from track $143,$ determine the number of tracks traversed by the $\frac{r}{w}$ head under each algorithm to service all requests: