Car X began traveling at an average speed of 35 miles per hour. After 36 minutes, car Y began traveling at an average speed of 38 miles per hour. When both cars had traveled the same distance, both cars stopped. How many miles did car X travel from the time car Y began traveling until both cars stopped? Choices
A) 105
B) 140
C) 175
D) 210
E) 245
In 36 minutes, car X travels 21 miles.   Car Y gains 3 miles each hour, so it takes 7 hours to catch car X.   In 7 hours, car X travels 245 miles.   The answer is 245.
<result>E</result>
Car X began traveling at an average speed of 35 miles per hour. After 36 minutes, car Y began traveling at an average speed of 38 miles per hour. When both cars had traveled the same distance, both cars stopped. How many miles did car X travel from the time car Y began traveling until both cars stopped?