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Every evening, Mr. Fat walks around a square city block once. Beginning at a corner, he would walk the first three sides at 6 feet per second and the final side at 5 feet per second. What is his average speed in feet per second? Express your answer as an improper fraction.

 Jun 17, 2020
 #1
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I need help with the subsets of S one

 Jun 17, 2020
 #2
avatar+902 
+1

deleted...

 Jun 17, 2020
edited by hugomimihu  Jun 17, 2020
 #3
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Thats incorrect

 Jun 17, 2020
 #4
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x= side length.  
  X/6 time for one side at 6 f/s

  x/5 time for one side at 5f/s

 

4x / (x/6.  + x/6.  +x/6.  + x /5)

4x/(x/2+x/5)

4x/(7x/10)

 

40/7=40/7 = 5.7142857142857143 f/sec avg

 Jun 17, 2020
 #5
avatar+902 
+2

Say that the distance of 1 side is 30 feet

 

So the first three, he spends 15 seconds, for the last, 6. so 21 seconds, for 120 feet.

 

21/120 = 7/40 as guest said.

 Jun 17, 2020

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