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Alice travels at an average speed of 60miles per hour from her home to a grocery store. She travels back to her home via same route at an average speed of 80 miles per hour. What is the average speed of her entire journey?

  • a)

  • b)

  • c)
    70

  • d)
    75

  • e)
    82

Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Alice travels at an average speed of 60miles per hour from her home to...
2xaxb
  a+b
2x60x80
  60+80
2x6x80
    14
480
  7
so (b) option
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Most Upvoted Answer
Alice travels at an average speed of 60miles per hour from her home to...
Average speed = total distance / total time travel.

in this case: let call the distance from home to grocery is x; then time to go from home to grocery is x/60; then time from grocery back home is x/80

So average speed of entire journey = 2x / (x/60 +x/80) = 68,571
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