P is four times as fast as Q and working together, they…

P is four times as fast as Q and working together, they can complete a work in 20 days. In how many days can Q alone complete 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 #28979