Question: Stan and Ollie are standing next to a train track. Stan puts his ear to the steel track to hear the train coming. He hears

Stan and Ollie are standing next to a train track. Stan puts his ear to the steel track to hear the train coming. He hears the sound of the train whistle through the track 2.1 s before Ollie hears it through the air. How far away is the train?

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