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 #1
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If the person jogs  at a rate of 12 km  per hr  for 30 min......he/she  covers  12 km * 1/2  hr =  6 km

 

6 km =  6000m =  total distance jogged

 

Since this represents 10 laps.....then  1 lap =   6000 / 10   =    600m  = the perimeter of the  field

 

Perimeter =  2  [ L + W ]

 

And L  = 2W

 

So....substituting, we have that

 

600 = 2 [ 2W  + W]     divide both  sides  by 2

 

300 =   [2W  + W]

 

300   = 3W      divide  both sides by 3

 

100  = W        and  L = 2W = 2(100) =  200

 

Area =  L* W =     200 * 100  =    20000 m^2

 

 

cool cool cool

 Nov 25, 2020

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