A 565-mile, 5 hour plane trip was flown at two speeds. For the first part of the trip, the average speed was 105 mph. For the remainder of the trip, the average speed was 125 mph. How long did the plane fly at 105 mph?
A) 2 h
B) 6 h
C) 3 h
D) 7 h
E) 4 h

Question

Quizplus · Accepted Answer

Let x be the time flown at 105 mph. Then, the time flown at 125 mph is (5-x) hours.
Using the formula: distance = speed x time, we can write:
105x + 125(5-x) = 565
Solving for x, we get:
x = 3
Therefore, the plane flew for 3 hours at 105 mph. Thus, the answer is choice C.

A 565-Mile, 5 Hour Plane Trip Was Flown at Two