In a circular race of 4800m, A and B start from the same point and at the same time with speeds of 36 km/h and 54 km/h.When will they meet again for the first time on the track if they are running in the opposite direction?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 192 second.
⇒ Speed of A: 36 km/h = 36 × (1000 m / 3600 s) = 10 m/s
⇒ Speed of B: 54 km/h = 54 × (1000 m / 3600 s) = 15 m/s
Calculate their combined speed (since they're running in opposite directions):
⇒ Combined speed = Speed of A + Speed of B = 10 m/s + 15 m/s = 25 m/s
Calculate the time taken to meet:
⇒ Time = Distance / Combined speed = 4800 m / 25 m/s = 192 seconds
Therefore, A and B will meet again for the first time on the track after 192 seconds (or 3 minutes and 12 seconds).