The bus that travels from St. Louis to Chicago and back comes to St. Louis every 6 hours while the bus that travels from St. Louis to Springfield and back comes to St. Louis every 2 hours. If at 12:00 o'clock both bused arrived at St. Louis, at what time will they meet in St. Louis again?
Choose the correct answer:	A) 16:00.	B) 18:00	C) 20:00	D) 22:00.	E) 24:00.
Time taken by bus to travel from St. Louis to Chicago and back comes to St. Louis = 6 hours   Time taken by bus to travel from St. Louis to Springfield and back comes to St. Louis = 2 hours   Time taken by both buses to meet again in St. Louis will be LCM of 6 and 2 = 6   If the buses start at 12:00 o'clock from St. Louis , they will meet again in St. Louis at 18:00 hours   Answer 18:00
<result>B</result>
The bus that travels from St. Louis to Chicago and back comes to St. Louis every 6 hours while the bus that travels from St. Louis to Springfield and back comes to St. Louis every 2 hours. If at 12:00 o'clock both bused arrived at St. Louis, at what time will they meet in St. Louis again?