A car averages 35 miles per hour for the first 4 hours of a trip and averages 44 miles per hour for each additional hour of travel time. If the average speed for the entire trip is 38 miles per hour, how many hours long is the trip?  Choices:
A) 6
B) 8
C) 10
D) 12
E) 14
Let T be the total time of the trip.   35*4 + 44(T-4) = 38T   6T = 176-140   T = 6   The answer is 6.
<result>A</result>
A car averages 35 miles per hour for the first 4 hours of a trip and averages 44 miles per hour for each additional hour of travel time. If the average speed for the entire trip is 38 miles per hour, how many hours long is the trip?