One pipe can fill a tank twice as fast as another pipe. If together the two pipes can fill the tank in 40 minutes, then the slower pipe alone will be able to fill the tank in:
A)108 min B)154 min C)144 min D)120 min

• D) 120
  
  (1/x) + (2/x) = (1/40)
  x = 120
• 3 years agoHelpfull: Yes(1) No(1)
• efficiency of 1st pipe = 2
  efficiency of 2nd pipe = 1
  total capacity of a tank = 40*3 =120
  2nd pipe required time = 120/1=120minute
• 3 years agoHelpfull: Yes(1) No(0)