SOLUTION: an airplane traveled the first 96 miles of a flight at an average rate of speed of 16 miles per minute. It then traveled another 18 minutes at a rate of speed of 12 miles per minu

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Question 588442: an airplane traveled the first 96 miles of a flight at an average rate of speed of 16 miles per minute. It then traveled another 18 minutes at a rate of speed of 12 miles per minute. what is the average rate of sped for the whole flight.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The average speed is ( total distance ) / ( total time )
For 1st part of trip:
+96+=+16t+
+t+=+6+ min
where t is time in minutes
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For 2nd part:
+d+=+12%2A18+
+d+=+216+ mi
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The total distance is:
+96+%2B+216+=+312+ mi
The total time in minutes is
+6+%2B+18+=+24+ min
+312+%2F+24+=+13+
The average speed for the who;e flight is 13 mi/min