4 people take different time to cross the bridge and only 2 at a time can cross it, and move at the speed of slower person. They need to use a torch to cross the bridge. There is only one torch with them. Time taken by them is given below

A- 1 min

B- 2 min

C-5 min

D-8 min

Find the minimum time taken by them to cross it. 

  1. 16 min
  2. 17 min
  3. 15 min
  4. 18 min

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