College Physics
posted by Austin .
How long does it take an automobile traveling in the left lane of a highway at 60.0 km/h to overtake (become even with) another car that is traveling in the right lane at 20.0 km/h when the cars' front bumpers are initially 75 m apart?

The 75 m gap between cars is reduced at a rate of 6020 = 40 km/h, which is 11.11 m/s.
Divide 75 by 11.11 for the number of seconds needed to close the gap.