how long does it take an automobile traveling at 76.9 km/h to become even with a car that is traveling in another lane at 57.9 km/h if the cars' front bumpers are initially 145 m apart?
The distance between the cars is reduced at a rate 76.9-57.9 = 19 km/h = 5.28 m/s
To close a gap of 145 m will require
145m/5.28m/s = 27.4 seconds