A and B start running simultaneously, around a circular track of 1200 m, in the same direction, at a speed of 8 m/s and 12 m/s, respectively. A and B will meet at the starting point for the first time after:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 300 s.
Relative speed = 12 – 8 = 4 m/s
Track length = 1200 m
Time to meet at starting point = LCM of their individual times to complete one round.
A’s time = 1200 / 8 = 150 s
B’s time = 1200 / 12 = 100 s
LCM of 150 and 100 = 300 seconds