On a 570-mile trip, Andy averaged 5 miles per hour faster for the last 122 miles than he did for the first 448 miles. The entire trip took 10 hours. How fast did he travel for the first 448 miles?

Question

mathstudent55 · Answer

The first part of the trip took t time.
Its average speed was 448/t
The second part of the trip took 10 - t time
Its average speed was 122/(10 - t)
The last 122 miles were traveled at 5 mph faster than the first 448 miles:
122/(10 - t) = 448/t +5
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