A can do a piece of work in 5 days of 9…

A can do a piece of work in 5 days of 9 hours each and B alone can do it in 5 days of 3 hours each.how long will they take it to do working together 2 1/4 hours a day?

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 #15239