A tap can fill a tank in 16minutes and another can empty it in 8minutes.if the tank is already 1/2 full and both the taps are opened together,will the tank be filled or emptied? How long will it take before the tank is either filled completely or emptied completely as the case may be? (a)emptied;16mins(b)filled;8mins(c)emptied;12mins(d)filled;12mins(e)none of these

• emptied in 8mins... so none of these e) is answer
  in 8 min a tap can empty full tank..
  in 8 min a tap can fill half tank...so in 8 min ther will be full tank(half tank+half filled from tap)
  this filled tank will be emptied in 8 min......
• 13 years agoHelpfull: Yes(21) No(2)
• a)1/8-1/16=1/16
  emptied in 16 mins
• 13 years agoHelpfull: Yes(6) No(9)
• Rate of tap of filling a tank = 1/16
  empty = 1/8
  
  so tank will get filled in 1/8-1/16 = 1/16
  
  i.e 16 min to completely fill the tank
  and since tank is already 1/2 filled
  so Ans is (b)filled;8mins
• 13 years agoHelpfull: Yes(4) No(15)
• as rate of empty is fast then filling so tank emtied per min is
  1/8-1/16=1/16;
  so full tank is emptied in 16 minss
  1/2 tank is emtied in 8min
• 13 years agoHelpfull: Yes(4) No(4)
• if a pipe fills a tank in x time and another can empty is in y time,
  then if x>y then, it will be empty in xy/(x-y)time
  if x
• 13 years agoHelpfull: Yes(2) No(5)
• part of the tank filled in 1min= 1/8- 1/16= -1/16
  since there is a -ve sign,therefore the tank gets emptied and not filled.
  Time taken to empty the whole tank= 16min
  so time taken to empty half the tank= 8 min
• 12 years agoHelpfull: Yes(0) No(2)