A and B run a 12 km race on a circular track of length 1200 m. They complete one round in 300 seconds and 400 seconds, respectively. After how much time from start will the faster person meet the slower person for the last time?

A. 2400 seconds

B. 8400 seconds

C. 9600 seconds

D. 10800 seconds

Answer: Option A

Solution(By Examveda Team)

Track length = 1200 m
Total length of the race = 12 km
A = 300 sec
B = 400 sec
1^st meeting (LCM of 300 and 400) = 1200 sec
2^nd and last meeting = 2400 sec