SOLUTION: Hi Becky walks to the stadium which is 580m way from her house for 20min . She walks back to her house using the same route at a speed of 20m per minute. What is her average spe

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Question 1185644: Hi
Becky walks to the stadium which is 580m way from her house for 20min . She walks back to her house using the same route at a speed of 20m per minute.
What is her average speed.
Thanks
Found 3 solutions by josgarithmetic, Alan3354, MathTherapy:
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!
Going, or 29 meters per minute
Returning, minutes


total distance, meters
total time minutes

Average speed,
23.7 meters per minute
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
Becky walks to the stadium which is 580m way from her house for 20min . She walks back to her house using the same route at a speed of 20m per minute.
What is her average speed.
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Avg speed going is 580/20 = 29 m/min
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Avg speed for round trip = 2*29*20/(29+20) =~ 23.67 m/minute
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I don't recommend memorizing formulas generally, but the avg speed for a round trip is 2*v1*v2/(v1+v2).
This is the same as for parallel flows, parallel resistors, parallel work, etc. except for the factor of 2.
Answer by MathTherapy(10551)   (Show Source): You can put this solution on YOUR website!

Hi
Becky walks to the stadium which is 580m way from her house for 20min . She walks back to her house using the same route at a speed of 20m per minute.
What is her average speed.
Thanks 


Total Distance: 2(580) = 1,160 m


Time spent going: 20 minutes
Time spent returning: 
Total Time spent on trip: 20 + 29 = 49 minutes

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