A can do a work in 40days, B in 60days

A can do a work in 40days, B in 60days. A alone start the work after 10days he left work. In how many days B can finish 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 #37095