An automotive test consisted of driving a car the same distance three separate times, first at an average rate of 50 miles per hour, then 60 miles per hour, then 80 miles per hour. If the test took 30 hours to complete, how many miles was the car driven during the entire test?  Select:
A) 1500
B) 1830
C) 1645
D) 1562
E) 1600
let x be the distance..   so time taken by three cars is x/50,x/60,x/80... total time taken= x/50+x/60+x/80=x*59/1200 =30(given)   x=610... total =3x=1830   Answer is 1830
<result>B</result>
An automotive test consisted of driving a car the same distance three separate times, first at an average rate of 50 miles per hour, then 60 miles per hour, then 80 miles per hour. If the test took 30 hours to complete, how many miles was the car driven during the entire test?