Two pipes can fill a tank in 5 hours and 10 hours

Two pipes can fill a tank in 5 hours and 10 hours. While the 3rd pipe empties the full tank in 10hours. If all the 3 pipes are open in how much time will the tank be filled?

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 #41013