Question 912535
D Distance Hopkinsville is from starting point 
{{{(D+10)/60 - D/50 = (1/30) hr}}}|Multiplying thru by 300 so as all denominators = 1
50(D+10) - 60D = 10
50d + 500 - 60D = 10
490 = 10D
49MI = D, Distance Hopkinsville is from starting point