/jp/ - Otaku Culture

There is a lit candle, 5cm in length.

In one hour, this candle will burn half of its length at that time.
And when its length drops below 1cm, the flame will go out.

After 3 hours, the flame has gone out, but at this moment, how many mm long is the candle?

A: 0mm
B: Approximately 3mm
C: Approximately 6mm
D: Approximately 8mm
E: Approximately 10mm