Ajay, Ramya, Suresh and Mary are at one end of a bridge. It is pitch dark and they have only one torch light. They need to get to the other side and have to carry the torch. Ajay can cover the distance in 1 minute, Suresh in 2 minutes, Ramya in 5 minutes
17 minutes
20 minutes
18 minutes
24 minutes
21 minutes

• FULL QUESTION - MARY takes 10 minutes;
  sol -
  (1) & (2) Cross with Torch 2
  (1) Returns with Torch 1
  (5) & (10) Cross with Torch 10
  (2) Returns with Torch 2
  (1) & (2) Cross with Torch 2
  TOTAL 17
  EXPLANATION-http://puzzles.nigelcoldwell.co.uk/twentyfive.htm
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• qestion is not complete , as no time limit for mary has given...........
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• Bhai kon chutiya dala hai yar ye incomplete question , kya farzi website hai hyar kuch bh daldo accept kr leti hai
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• 25. Adam, Bob, Clair and Dave are out walking: They come to rickety old wooden bridge. The bridge is weak and only able to carry the weight of two of them at a time. Because they are in a rush and the light is fading they must cross in the minimum time possible and must carry a torch (flashlight,) on each crossing.
  
  They only have one torch and it can't be thrown. Because of their different fitness levels and some minor injuries they can all cross at different speeds. Adam can cross in 1 minute, Bob in 2 minutes, Clair in 5 minutes and Dave in 10 minutes.
  
  Adam, the brains of the group thinks for a moment and declares that the crossing can be completed in 17 minutes. There is no trick. How is this done?
• 9 Months agoHelpfull: Yes(0) No(0)