Question

how can we say that light propagates faster than sound?

Answer 1

Light doesn't need a medium to travel. The speed of sound through air is about 340 meters per second. It's faster through water and it's even faster through steel. Light will travel through a vacuum at 300 million meters per second..
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Answer 2

Light propagates faster than sound as it needs no medium to travel and its speed is much faster than that of sound i.e.,

$3 \times 10 {}^{8} metre \: per \: second$
and that of sound is

$344 \: metre \: per \:second$

So as You can see light has a faster speed than sound so it propagates more fastly than sound.

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