Raju and Sohan started a car race from the same point, in the same direction and at the same circular track of length 1725 m with speeds of 72 km/h. and 90 km/h, respectively. After how much time (in seconds) will they meet again for the first time?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 345 seconds.
Raju's speed = 72 km/h = 72 × (5/18) m/s = 20 m/s
Sohan's speed = 90 km/h = 90 × (5/18) m/s = 25 m/s
Relative speed = 25 - 20 = 5 m/s
Time taken to meet again = 1725/5 = 345 sec