operating system subject

Suppose the head of a moving-head disk with 200 tracks numbered 0 to 199 is currently serving a request at track 100 and has just finished a request at track 105. The queue order of outstanding requests in FIFO order is:

90, 140,10,130,15,35

What is the total number of head movements (in cylinders) for the following disk-scheduling algorithms?

a) FCFS

b) SSTF

c) SCAN