Which expression represents the time she spent driving?

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Katalin drove 300 miles on her vacation. She drove an average of 1.9 times faster on the second 150 miles of her trip than she did on the first 150 miles of her trip. Which expression represents the time she spent driving? Let x = her speed on the first half of the trip.

a.  457.89 / x

b.  228.95 / x

c.  435 / x 

d.  228.95x

Apr 30th, 2015

Speed = Distance ÷ Time then Time = Distance ÷ Speed
The time taken for the first 150 miles is, 150/x
The time taken for the second 150 miles is, 150/1.9x
The time for the complete journey = 150/x + 150/1.9x = 228.95x


Please let me know if you have any other questions and best me if you are satisfactory. 

Apr 30th, 2015

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Apr 30th, 2015
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