9) Aman walking at the speed of 4 km/h crosses a square field diagonally in 3 minutes. The area of the field (in m2) is:

• convert speed into m/s i.e
  4*5/18 = 2/9
  this is distance covered in 1 sec.
  so distance covered in 3 min i.e 180 sec = 2/9*180
  = 200m
  this is the lenth of diagonal
  and are of square = 1/2 (daigonal)*(diagonal)
  1/2*200*200
  20,000 m2
  
• 10 years agoHelpfull: Yes(25) No(9)
• 4KMPH=10/9 M/SEC
  DIST=S*T
  =10/9 * 3*60
  =200 METERS
  AREA OF SQUARE = 1/2 DIAGONAL SQUARE
  =20000 M2
• 10 years agoHelpfull: Yes(11) No(1)
• 20,0000 m2
• 10 years agoHelpfull: Yes(1) No(0)
• its 45000m2
  
• 10 years agoHelpfull: Yes(0) No(8)
• change speed in m/s = 4 * (1000/60) = 200/3
  length of diagonal= (200/3) * 3 = 200m
  area of sqr. = 1/2*(diagonal)*(diagonal) = 1/2*200*200 = 20,000 m2
• 10 years agoHelpfull: Yes(0) No(0)
• 4km/h means 200/3 mt/ min. In 3 min. A man covers 200 meters. And sides of square is equal its means one side of square is 100 mt. Now we can apply areas formula ans is 1 m^2
• 10 years agoHelpfull: Yes(0) No(1)
• change speed in m/s = 4 * (1000/60) = 200/3
  length of diagonal= (200/3) * 3 = 200m
  area of square = 1/2*(diagonal)*(diagonal) = 1/2*200*200 = 20,000m2
• 10 years agoHelpfull: Yes(0) No(0)
• change speed in m/s = 4 * (1000/60) = 200/3
  length of diagonal= (200/3) * 3 = 200m
  area of sqr. = 1/2*(diagonal)*(diagonal) = 1/2*200*200 = 20,000 m2
  
• 10 years agoHelpfull: Yes(0) No(0)
• 12.96
  distance=4*3*60=720
  area of square=1/2*(720)^2=12.96m2
• 10 years agoHelpfull: Yes(0) No(0)
• the speed in m/s is= 4*5/18 = 10/9 m/s.
  the time taken is 3 min= 180 sec.
  so distance = 10/9*180=200 meters
  so side^2+side^2=40000
  side^2= 20000 meter square.
• 10 years agoHelpfull: Yes(0) No(0)
• area=20000m2
  d=s*t
  convrt speed into m/min
  square area=1/2(diagonal square)
  
• 10 years agoHelpfull: Yes(0) No(0)
• ans is 20000m2
  
• 10 years agoHelpfull: Yes(0) No(0)
• diagonal=(4*1000*3)/60 meter=200 meter
  area=a^2=(200/square root of 2 )^2
  
• 10 years agoHelpfull: Yes(0) No(0)
• diagonal=(4*5/18*3*60)m=200 m
  area=(1/2)*200^2 m2
  =2*10^4 m2
• 9 years agoHelpfull: Yes(0) No(0)