How to pronounce 時速 in Cantonese (4 out of 8):

時速降低到十幾二十
It's down to 10 or 20.

Cantonese Sentence Breakdown

時速 si4 cuk1
speed per hour
降低 gong3 dai1
reduce
dou3
to (a place)
until (a time)
up to
to go
to arrive
(verb complement denoting completion or result of an action)
been to
a particle used after a verb or adjective to indicate degree
extent
十幾 sap6 gei2
about ten
二十 yi6 sap6
twenty