# Physics

How long does it take an automobile traveling
72.5 km/h to become even with a car that is
traveling in another lane at 55.5 km/h if the
cars’ front bumpers are initially 146 m apart?

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1. The faster automobile is basically playing a catch-up game, with a distance (gap) of 146 m. at a catch-up speed of 72.5-55.5=17 km/h.
Converting this speed to m/s:
17 km/h = 17*1000 m/3600 s = 4.72 m/s

How long will it take to catch up a distance of 146m at a speed of 4.72 m/s ?

Use time = distance/speed.

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posted by MathMate

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