How to pronounce 超速 in Cantonese (4 out of 5):

咁既然無人知係咪超速

Cantonese Sentence Breakdown

gam3
so (Cantonese)
Mandarin equivalent: 这样zhèyàng [这样], like this
既然 gei6 jin4
since
無人 mou4 jan4
no one
zi3
an alternative form for 智,wisdom
係咪 hai6 mai6
used in asking questions in conversations, similar to saying "is it ….?"; "Isn't it?"
"Yes or no?"
超速 ciu1 cuk1
speeding