A bridge has to be crossed. only 2 persons can cross it at a time because only 1 torch is available which is necessary to cross it. there are 4 peoply named acc. to the time they take to cross i..e 1,2,5 and 10 (they take the time in sec).what minimum time will they take to cross the bridge ??

• 17 sec
  
  1st 1 and 2 will cross the bridge which takes ==> 2 seconds
  and 1 will come back with the torch ==> 1 second
  then 5 and 10 will cross ===> 10 seconds
  2 will come back with the torch == > 2 second
  finally 1 and 2 will cross the bridge ==> 2 second
  
  total time taken = 2+1+10+2+2 = 17 seconds
• 10 years agoHelpfull: Yes(2) No(1)
• the answer is 17
  
• 10 years agoHelpfull: Yes(0) No(1)