A can do a job in 12 days and B can do…

A can do a job in 12 days and B can do it in 15 days. A and B working together will finish twice the amount of work in days?

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 #85298