Answers

2014-07-13T21:09:14+08:00
To answer it easily, you should tabulate first the data
               Rate(r)        Time(t)             Distance(d)
Car A      80kph         t                    528-d
Car B      96kph         t                       d

since we are looking for the time we can equate the equation in terms of the distance(d)
d=rt
For Car A
528-d=(80)(t)
d=-80t + 528
For car B
d=96t

equating both
96t=-80t + 528
176t=528
t=3

therefore, in 3 hours, they would be 528km apart



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