book Maths Puzzle Numerical Ability

The speed of an Amtrak passenger train is 14 mph faster than the speed of a Central Railway freight train. The passenger train travels 400 miles in the same time it takes the freig

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I am having a hard time with this question, divide

m^2 n^3 mp
------- by ------
p^3 n^2

I think the answer is

m^3
-------
np^2

Am I right, Can somone let me know? Please solve each system by graphing. Please help me solve the following problem.

1. y = 2/3x
x = y + 3