Answer:
See below
Explanation:
20 minutes = 1/3 hr
distance / rate = time
x = rate1 x+6 = rate2
39 mi / ( x + x+6 m/hr ) = 1/3 hr
39/(1/3) = 2 x + 6
x = 55.5 mi/hr x+6 = 61.5 mi/hr
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