A train 420 m long, running with a speed of 63 km/hr…

A train 420 m long, running with a speed of 63 km/hr will pass a tree in?

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 #15203

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