On a circular race track of 2500 m, Sahil and Reena are running in the same direction at speeds of 27 km/h and 45 km/h, respectively. After how much time will they meet each other for the first time?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e 500 seconds.
Length of track = 2500 m
Speeds:- Sahil = 27 km/h and Reena = 45 km/h
They are running in same direction
Relative speed = 45 - 27 = 18 km/h or 18 × (1000/3600) = 5 m/s
Time to meet (i.e., Reena gains one full lap on Sahil) = Distance / Relative speed
Time = 2500 / 5 = 500 seconds