A and B together can do a work In 4 days

A and B together can do a work In 4 days. A alone can do it in 12 days. What time B will take to do the work alone?

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 #27175