sandra while walking diametrically across a semicircular playground, takes 3mins less than if she had kept walking around the circular path from A to B. if she walks 60 metres a minute , what is the diameter of the playground?

• if we take radius is r then diameter is 2r now as said
  pi*r-2r=180(in 3min goes 180 mtr)
  by calculating r =157.5mt
  so 2r=315 mtr
  diameter =315mtr
• 11 years agoHelpfull: Yes(10) No(0)
• in one min , she walks 60 meters..... it means in 3min,she walks 180 meter extra
  now,
  circumfrence of semi circle = 22/7(r)... where r is the radius
  diameter of semi circle = 2r
  therefore,
  22/7(r)= 2r+180
  8/7(r)= 180
  r=(180*7)/8
  2r=(45*7)=315 m
  
• 11 years agoHelpfull: Yes(6) No(0)
• let radious=r
  so according to question
  3=(pi*r/2)/60 - r/60
  find out r
  ie 631.54 m
  then diameter =r*2;
  
• 11 years agoHelpfull: Yes(0) No(0)
• my ans is 114.59
• 11 years agoHelpfull: Yes(0) No(0)