On a 200-m-long circular track, two people start from the same point, at the same time, at speeds of 12 km/h and 15 km/h, respectively. After how much time will they meet again for the first time if they are running in the same direction?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e 240 sec.
Track length = 200 m = 0.2 km
Speed of first person = 12 km/h
Speed of second person = 15 km/h
Both start together in the same direction
Relative speed = 15 - 12 = 3 km/h
Time to meet again = Distance ÷ Speed = 0.2 km ÷ 3 km/h = 1/15 hours
Convert to seconds = 1/15 × 3600 = 240 sec.