$5:30$-$30$ minutes=$5:00$ 
A train was supposed to arrive at a $$MRT$$ station at $$5:30 \rm pm.$$ But the train arrived half an hour early because of a traffic accident and changed another line. What time did the train reach the $$MRT$$ station? (adapted from 2008 Math kangaroo Problems, Level 3-4 , Question \#6） 
Options:
- $5:00$ pm 
- $4:30$ pm 
- $4:00$ pm 
- $5:30$ pm 
- $4:40$ pm 