"Set a date quickly; otherwise, it will be too late."

Translation: Fixez une date rapidement, sinon il sera trop tard.

[blas_]

why is using "vite" wrong here?

[POISSONJos]

Fixe une date vite sinon... sounds weird.
You can hear: fixe une date... vite! as an interjection.
you can also say vite instead of rapidement but in this case vite is not at the end of the sentence: fixe vite une date sinon...

[Crotchet]

I found I could use 'vite' after all; it was a question of its position!

[JLN20]

Why " fixe une date rapidement, sinon ce sera trop tard" is wrong ?

[Bee_338]

now accepted

[POISSONJos]

Your answer is absolutely correct. Report it.

[Gariphonyo]

Fixe une date rapidement; siono il sera trop tard.←this is not accept yet. why~?

[MarieLudivine]

Sometimes Duo will let some spelling errors go by, but they probably rejected your misspelling of sinon.

[JohnnyB809998]

'Fixez vite une date' accepted 2/8/22.