The boat moves downside 50km and upside 10km in 2 hours each

The boat moves downside 50km and upside 10km in 2 hours each. Then find the boat speed in still water?

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 #76242

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