In a circular race of 840 m, A and B start running in the same direction at the same time from the same point at the speeds of 6 m/s and 12 m/s, respectively. After how much time will they meet next?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 140 s.
Relative speed = 12 − 6 = 6 m/s
They will meet when B gains 1 full round over A, i.e., 840 m
Time = Distance / Relative speed = 840 / 6 = 140 seconds