A can do a work in 12 days

A can do a work in 12 days. B can do the same work in 24 days. If both A & B are working together in how many days they will finish the work?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #86171