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pegah
If the train traveled 630 miles in 6hrs, then it can travel 630/6 miles per hour! 
So, the answer is: 105 miles per hours. 

Have a wonderful day :) 
A proportion can be used to solve this problem.
(630 miles) / (6 hours) is equal to (? miles) / (1 hour).
Cross multiply and divide to get: (630 miles x 1 hour) / 6 hours = 105 miles.