Perpendicular lines have slopes that are inverse reciprocals of each other. That would give you the new slope in your equation. After that plug (6,2) into point slope form and solve to get your final equation.
Divide miles by 60 to convert it to miles per minute because there are 60 minutes in an hour.
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So
I=P⋅i⋅t=Ii⋅t=50000.04⋅6=20833.33
It will take him 120 mins as he runs 8 minute miles