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TootsieR
If you have a scientific calculator, enter in 45/25. You will get a decimal, but on some, if not most, calculators, it can convert it to fractions for you.
You will get: 9/5 mph.
Mixed number: 1 and 4/5

You have to divide 45/25 or used the calculator but if you want the answer to be as a fraction in lowest terms you have to simply 45 and 25 by 5

45 /25 divide by 5 will be= 9/5 if you simplify it again will be 1 and 4/5.