英语翻译The original railway from A to B is 310 km,and now a 280

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英语翻译
The original railway from A to B is 310 km,and now a 280 km long high -speed railway is built .The train speed on the high - speed railway is twice the original speed,so the tralving time from A to B is 2 hours shorter.Then the original train speed on the original railway is___km/hour.

原始的铁路距离从A到B 是310公里,但是目前一条长280公里的高速铁路正在修建中,火车的速度是原先的两倍,所以旅行时间从A到B缩短了2个小时,所以呢,开始的火车速度是155公里每小时.
再问：我们老师说最终答案是85km/hour诶。。。。。
再答：这个题目啊，上面说缩短了2个小时，也没有说话了几个小时。你看看其他同学的答案，我都糊涂了按照上面的理解的话，我认为是155
再问：设速度为V 310/V -280/V=2 170/V=2 V=85km/hour
再答：好吧这是一道数学题，唉。

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