A cistern has three pipes,A, B and C

A cistern has three pipes,A, B and C. The pipes A and B can fill it in 8 and 12 hours respectively and C can empty it in 6 hours. If the pipes are opened in order at 1, 2 and 3 A.M. When will the cistern be empty?

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 #26138