Answer:
90 mph
Explanation:
To get miles per hour (), we just need to divide. gives us , meaning the train travelled 90 miles in one hour. This is the same as going 90 mph. Hope that explained things :)
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), we just need to divide. 
gives us 
, meaning the train travelled 90 miles in one hour. This is the same as going 90 mph. Hope that explained things :)