Assertion: penguin's swimming speed | /r/HasProperty | 6–9 km/h
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Source sentences:
text: Its average swimming speed is 6–9 km/h (3.7–5.6 mph).
text: Its average swimming speed is 6–9 km/h (3.7–5.6 mph).
text: When they’re not tobogganing – sliding over the ice on its belly, the Emperor Penguin walks with a wobbling gait or proves its swimming talents (its average swimming speed is 6–9 km/h).