A pipe of 2 inch diameter fills the water tank in one hour. If the diameter of the pipe is 4 inch in what
time will the pipe fill the same tank?

• d1=2 =>> r1=1
  d2=4 =>> r2=2
  r1^2---60min
  R2^2--??
  ??==60/4=15min
  
• 11 years agoHelpfull: Yes(8) No(1)
• The volume of water that flows through a pipe is proportional to the cross-sectional area (the area of a circle with diameter equal to the inside diameter of the pipe). Since the area of a circle is given by , the flow is proportional to the square of the radius.
  
  So 2^2 ---------- 60
  4^2 ---------- ?
  
  ?60 = 416
  therefore ? = 15
• 11 years agoHelpfull: Yes(5) No(5)
• yes bro nd sis use p1c1=p2c2 nd get answer easly
  1*1/2=c2*4/2 answer will get 1/4hour
• 9 years agoHelpfull: Yes(0) No(0)