SOLUTION: In order to full a water tank three pipes producing 12L/min, 16L/min, 20L/min of water are turned on at 30 min intervals. If they are turned on in the order given, how long after t

Algebra ->  Inequalities -> SOLUTION: In order to full a water tank three pipes producing 12L/min, 16L/min, 20L/min of water are turned on at 30 min intervals. If they are turned on in the order given, how long after t      Log On


   

Question 100919: In order to full a water tank three pipes producing 12L/min, 16L/min, 20L/min of water are turned on at 30 min intervals. If they are turned on in the order given, how long after the first pipe is turned on will a 1200 L tank be filled?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
let x=minutes ... 12(x)+16(x-30)+20(x-60)=1200

12x+16x-480+20x-1200=1200

48x=2880 ... x=60

last pipe not needed