6. (10 points) Type I and Type II electronic toy cars, each running on the same two circular tracks, with Type I completing one lap every 5 minutes and Type II every 3 minutes. At a certain moment, both Type I and Type II start their 19th lap exactly. Then, Type I started running ( ) minutes earlier than Type II.
A. 32
B. 36
C. 38
D. 54
【Analysis】From the problem, we know: both types of toy cars have just completed 18 laps. We also know that Type $I$ car takes $5-3=2$ minutes more per lap than Type II car. Therefore, the additional time taken for 18 laps is $18 \times 2=36$ minutes. This additional time is the time by which Type $I$ car is ahead of Type II car, which is 36 minutes.

【Solution】Solution: $5-3=2$ (minutes)
$18 \times 2=36$ (minutes)
Therefore, the answer is: $B$.