A man can row 24 kmph in still water

A man can row 24 kmph in still water. It takes him thrice as long to row up as to row down the river. Find the rate of the stream?

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 #28355