A man can row upstream at 8kmph and downstream at 13 kmph

A man can row upstream at 8kmph and downstream at 13 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.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #16589

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