The bus that travels from St. Louis to Chicago and back comes to St. Louis every 4 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 most appropriate option: 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 = 4 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 4 and 2 = 4   If the buses start at 12:00 o'clock from St. Louis , they will meet again in St. Louis at 16:00 hours   16:00.nswer 16:00.
<result>A</result>
The bus that travels from St. Louis to Chicago and back comes to St. Louis every 4 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?