A train 210 m long passed a pole in 21 sec

A train 210 m long passed a pole in 21 sec. How long will it take to pass a platform 310 m long?

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 #10217

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