SOLUTION: A certain large city has a circular road around the city and a road directly through downtown. The speed limit on the circular road is 65mph and the speed limit through downtown is

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Question 275862: A certain large city has a circular road around the city and a road directly through downtown. The speed limit on the circular road is 65mph and the speed limit through downtown is 35mph. If the road through downtown is 20 miles long, how long, to the nearest minute, will it take to travel each route?
Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website!
the road through downtown is the radius of the circle or the diameter. The info is not clear.if the road conencts twice to the circular road or only once
the circumference of the circle is 2*pi*r
so if the troad throught downtown connects to the circular road twice
then the diameter is 20 and the circumference is 3.14*20 or 62.80
r*t=d
65*t=62.80
t=62.80/65
35*t=20
t=20/35=4/7
if the road is only connected once to the circular road
then
2*20*3.14=125.6
65*t=125.6
t=125.6/65
35*t=20
t=4/7