SOLUTION: A train travels for 40 hours at a speed of 60 mph then the train travels for 2 hours at a speed of 75 miles per hour. What is the average speed?

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Question 560083: A train travels for 40 hours at a speed of 60 mph then the train travels for 2 hours at a speed of 75 miles per hour. What is the average speed?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The average speed is always ( total distance traveled ) / ( total elapsed time )
At 60 mi/hr:
+d+=+60%2A40+
+d+=+2400+ mi
At 75 mi/hr:
+d+=+75%2A2+
+d+=+150+ mi
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Total distance = +2400+%2B+150+
+2400+%2B+150+=+2550+ mi
Total time is +40+%2B+2+=+42+ hrs
Total distance /total time is +2550%2F42+=+60.714+ mi/hr