Mathematics, 11.07.2019 22:30 anniekwilbourne
An express train and a local train start out from the same point and the same time and travel in opposite directions. the express train travels twice as fast as the local train. after 4 hours they are 480 km apart. what is the average speed of the express train?
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An express train and a local train start out from the same point and the same time and travel in opp...
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