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 6 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 choice.
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 = 6 hours   Time taken by both buses to meet again in St. Louis will be LCM of 4 and 6 = 12   If the buses start at 12:00 o'clock from St. Louis , they will meet again in St. Louis at 24:00 hours   Answer 24:00.
<result>E</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 6 hours. If at 12:00 o'clock both bused arrived at St. Louis, at what time will they meet in St. Louis again?