question_answer

Three person A, B, C run along a 40 km long circular field. They start their race at 5 AM at same time and from same point at the speed of 12 km/hr, 16 km/hr and 20 km/hr respectively. After how much time they will meet again?

A)  15 hours                      

B)  13 hours

C)  12 hours                      

D)  10 hours

E)  None of these