Hi

D = r*t OR D/r = t  BOTH cars will be traveling the same amountof time

Let x represent car's distance traveling at 45mph, 

and (490-x) the distance traveled by the car going 60mph



Cross multiply to solve

60x = 45(490-x)

60x = 45*490 - 45x

115x = 45*490

x = 45*490/105

x = 210mi, car's distance traveling at 45mph

210mi/45mph = 4 2/3 hours or 4hr and 40 min. 

CHECKING OUR ANSWER 

 210MI + 60mph*14/3hr = 210mi + 280mi = 490mi 

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