A can do a certain work in 12 days

A can do a certain work in 12 days. B is 60% more efficient than A. How many days does B alone take to do the same job ?

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 #77369