posted by Dee on .
In a marathon race, Chad is out in front, running due north at a speed of 3.92 m/s. John is 92 m behind him, running due north at a speed of 4.33 m/s. How long does it take for John to pass Chad?
John's speed is 0.41m/s faster than Chad's
Since he is 92m behind, it will take him 92/.41 = 224.4 seconds to catch up.