A man goes downstream at 13 kmph, and upstream8 kmph

A man goes downstream at 13 kmph, and upstream8 kmph. The speed of the stream is

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 #37039