Two friends are running on a circular track of 720 m. They started from the same point and are moving in the same direction with speeds of 1.5 m/s and 3.5 m/s. After how much time will they cross each other for the second time?
Show answer & explanation
Correct answer: A
Explanation
The Correct answer is Option 1 i.e. 12 minutes.
Relative speed = 3.5 - 1.5 = 2 m/s
When they meet for the second time the distance of the track will be = 720 + 720 = 1440
Thus,
The time at which they will cross each other for the second time
Time = Distance/Speed
Time = 1440/2 = 720 seconds or 12 minutes