By walking at 3/4th of his usual speed, a man reaches office…

By walking at 3/4th of his usual speed, a man reaches office 5 minutes later than usual. What is his usual time?

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 #16443