A does a work in 10 days and B does the same…

A does a work in 10 days and B does the same work in 5 days. In how many days they together will do the same 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 #448