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Previous Year Question (PYQs)
Video solution of this question given below
Four friends A, B, C and D need to cross a bridge in
the night. A maximum of 2 people can cross at a
time. They have only one lamp. A takes one minute
to cross the bridge. B takes 2 minutes, C takes 8
minutes and D takes 11 minutes to cross the bridge
respectively. A pair must walk together at the speed
of the person who walks slowly. What is the
minimum time required to cross the bridge by all the four people?
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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
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Commented Jul 31 , 2023
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