A disk drive has 5000 cylinders, numbered 0 to 4999. The drive is serving a
request at cylinder 143 currently and the previous request was at 125. The disk I/O queue, in FIFO order, is
86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130
Starting from the current head position, what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests, for SCAN?