Question 999259
2025/225= 9 miles per minute. And how many minutes in 1 hour? 60 minutes:
9*60= speed in miles per hour. Punch the numbers in your calculator or smart phone and you're all set. 
Or do it in your head. How much is 6*9? I trust you know your multiplication tables? It's 54 and we have a zero from 60: 540 miles per hour.