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