In a circular race of 500 m, A and B start from the same point and at the same time at speeds of 36 km/hr and 45 km/hr in the same direction. After how long will they meet again for the first time on the track?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 200 sec .
A = 36 km/hr, B = 45 km/hr
Relative speed = 45 - 36 = 9 km/hr
Track = 500 m = 0.5 km
Time = 0.5 ÷ 9 hour = 1/18 hour
1/18 hour = 60/18 minutes = 10/3 minutes = 3 minutes 20 seconds = 200 seconds