A car averages 30 miles per hour for the first 6 hours of a trip and averages 46 miles per hour for each additional hour of travel time. If the average speed for the entire trip is 34 miles per hour, how many hours long is the trip?
Choose the correct choice from the following choices.
A) 8  B) 10  C) 12  D) 14  E) 16
Let T be the total time of the trip.   30*6 + 46(T-6) = 34T   12T = 276-180   T = 8   The answer is 8.
<result>A</result>
A car averages 30 miles per hour for the first 6 hours of a trip and averages 46 miles per hour for each additional hour of travel time. If the average speed for the entire trip is 34 miles per hour, how many hours long is the trip?