Question

Two runners start together on a 400 m circular track and run in opposite directions at 6 m/s and 4 m/s. When will they meet?

Solution

1. For opposite directions, relative speed = 6 + 4 = 10 m/s.
2. They meet after covering one complete circumference relative to each other.
3. Time = circumference / relative speed = 400/10 = 40 seconds.
4. Therefore, they meet after 40 seconds.