Use the following information to answer the next question.
| Two buses, one for Chandigarh and the other for Jammu, leave from a Delhi bus terminal every 18 minutes and 20 minutes respectively. At 8:30 pm, both the buses leave Delhi simultaneously for their respective destinations. |
At what time will the two buses leave Delhi simultaneously once again?
11:30 pm
11:00 pm
9:30 pm
9:00 pm