how should i crack this type of hash (sha1 & salt)

[iamatx]

sorry for hash thanks for the help

hashcat -m 120 -r rules/best64.rule --username -r append_two_dashes.txt hashes_with_dashed_salts.txt rockyou.txt

hashes_with_dashed_salts.txt=
a@gmail.com:848XXXc9e5baf34d6dba20XXX755f4984b6d77cc:74e3c24fd83d92ea72383e9b3a4292bdfb8exxxx

it's that correct?

and just one more help sorry for
(and am using gtx 1660 super but its giving me jus 8k-khs speed for md5 i used -w 3 update drivers still)