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Four persons can cross a bridge in 3,7,13,...

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Four persons can cross a bridge in 3,7,13,17 minutes. Only two can cross at a time. find the minimum time taken by the four to
cross the bridge.

  1. 10
  2. 20
  3. 23
  4. 24
Asked By : VickramCategory : Logical
Answer
b. 20
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