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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A CHOCOLATE CHIP COOKIE RECIPE ASKS FOR THREE AND ONE QUARTERS TIMES AS MUCH FLOUR AS CHOCOLATE CHIPS. IF TWO AND ONE HALF CUPS OF FLOUR IS USED WHAT IS THE QUANTITY OF CHOCOLATE CHIPS WOULD BE NEEDED ACCORDING TO THE RECIPE? Hi, please help!

I am trying to solve the system of linear inequalities by graphing, however, I cannot locate an example on this problem:

x + 2y is less than or equal to 3
2