In a circular race of 1 km, two persons X and Y start with the speed of 9 km/h and 18 km/h, respectively, at the same time from the same point. When will they meet for the first time at the starting point when running in the same direction?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 400 sec.
Relative speed of X and Y = 18 - 9 = 9 km/h
Time = 1/9 hr
⇒ 60 × 60 × 1/9 = 400 sec