these days news is traveling faster than before.
if your sentence is - These days news travelling faster then before.....then its wrong coz the sentence shud be........These days news travels faster then before !
Grammatical mistake: you left out the "is" for "news IS travelling"
But to write the sentence in good English, it should be "These days news travels faster than before."
It's a tricky one: both are present tense of the verb To Travel, but sometimes we'd use "is travelling" and sometimes "travels." Wretched language!
By the way, you also need to say what is THE grammatical mistake in my sentence.
Nevertheless, your English is a whole lot better than many native speakers' on this site!