Leroy spent 20 minutes jogging and 40 minutes cycling and burning 600 calories. The next day Leroy swapped times, doing 40 minutes of jogging and 20 minutes of cycling and burned the same number of calories. How many calories were burned for each minute of jogging and how many for each minute of cycling? Type in your system of equations and your final answer.  Do not forget your units and defining your variables.

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A: topic - linear equation in one variable