A line with slope 2 intersects a line with slope 6 at the point $(40,30).$ What is the distance between the $x$ -intercepts of these two lines?

5
20
10
50
25

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Since both lines go through (40,30), it's easily found that the formulas of the lines are y = 2x - 50 and y = 6x - 210. Setting y = 0 for both yields x = 25 and x = 35. So the difference is 10.