3buckets line are full 3 Are empty We have to select We have to arrange one full and one empty By selecting only one bucket? So how


2sandclock one take 5minutes and other take 4 Minute And we have to calculate
7minutes so how we will calculate?

• start both the clocks...
  when 4 min clock is over,revert it(while still a min to go in 5 min clock and remember it is still running).
  when 5 min clock is complete revert ur 4 min clock(now u just have 3 min in ur 4 min clock)and start counting ur time...
  
  remaining 3+4(u have to again revert the 4 min clock)
  hence 3+4=7
• 10 years agoHelpfull: Yes(6) No(0)
• start the 4 min glass, when that is half gone, start the 5 min glass
  
  2+5=7
• 10 years agoHelpfull: Yes(5) No(7)
• @mukesh, if we start both the clocks simultaneously, the 4 min clock will stop before the 5 min clock. so no use. What we can do is, start the 5 min clock, and hold on till it is over, and start the 4 min clock as soon 5 min is complete and stop it when its half completes. so the answer would be 5+2=3
• 10 years agoHelpfull: Yes(1) No(0)
• arrangement in each place = 3x3x2x2x1x1 =36
• 10 years agoHelpfull: Yes(0) No(0)
• Initially we will start both clock.
  Then when 5min clock stop we will start counting.
  And 4min clock going up to 3-times.
  
  Hence-4x3-5=7min.
  
  Illustration
  5min
  -------
• 10 years agoHelpfull: Yes(0) No(0)
• 5min
  -----------
• 10 years agoHelpfull: Yes(0) No(0)