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Average Speed

 
Sameer Jamal
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It was a long drive. I drove 60 miles at 30 miles per hour and then an additional 60 miles at 50 miles per hour. What was my average speed over the 120 miles.
 
Jayesh Lalwani
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Is this a homework for your kid, or is there a trick that I'm missing/

60 miles at 30mph will take 2 hrs
60 miles at 50mph will take 1.2 hrs

total time = 3.2 hrs

average speed = 120/3.2 = 37.5mph
 
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