Q. IF only half the pipes of set X are closed and only half the pipes of set Y are open and all other pipes are open, how long will it take to fill 49% of the tank

Option
A)5 min
B)6 min
C)7 min
D)7.5

• half of X open , half of Y open and all pipes of Z open
  => In 1 min , (1/20) + (1/16) - (1/20) = (1/16)th tank is filled
  
  49% => 49/100
  
  Time taken to fill 49% = 16*49/100 = 7.84 min ~ 7.5 min
• 10 years agoHelpfull: Yes(0) No(0)