Joke Collection Website - Mood Talk - An express train and a local train leave from Party A and Party B at the same time and meet in 6 hours. The speed of the local train is known.
An express train and a local train leave from Party A and Party B at the same time and meet in 6 hours. The speed of the local train is known.
An express train and a local train leave from Party A and Party B at the same time and go in opposite directions. Six hours later, they met 30 kilometers away. At this time, the express train travels 30 * 2 = 60km more than the local train, so the express train travels 60 ÷ 6 = 10km more than the local train every hour.
So the express speed10+80 = 90km.
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