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Doctors Medicines MCQs Q&A

  1. 23 minutes
  2. 20 minutes
  3. 18 minutes
  4. 16 minutes
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1 Answers

Option 1 : 23 minutes

Friends

Time taken to cross bridge

A

1 minute

B

2 minutes

C

8 minutes

D

11 minutes

A pair must walk together at the speed of the person who walks slowly.

As A takes the shortest time, so each friend will walk with A.

Time taken:

A crossing the bridge with B and then retuning = 1 + 2 minutes

= 3 minutes

A crossing the bridge with C and then retuning = 1 + 8 minutes

= 9 minutes

A crossing the bridge with D = 11 minutes

A won’t return as none of the friend is left.

So, the minimum time required to cross the bridge by all the four people = (3 + 9 + 11) minute

= 23 minutes

Hence, ’23 minutes’ is the correct answer.

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