In a circular race of 1600 m, A and B start from the same point and at the same time with speeds of 27 km/h and 45 km/h, respectively. After how long will they meet again for the first time on the track when they are running in the same direction?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 320 seconds.
Speed of A = 27 km/h or 27 × 5/18 = 7.5 m/s
Speed of B = 45 km/h or 45 × 5/18 = 12.5 m/s
Relative Speed between A and B = Speed of B − Speed of A = 12.5 m/s − 7.5 m/s = 5 m/s
Time they meet again for the first time on the track when they are running in the same direction = =