Bridge
Crossing
Thanks
Ranish
Five persons are standing
on one
side of a bridge.
They
want to
cross the bridge.
Without
a
torch, they cannot proceed.
Only
one
torch is available.
The
torch
has a remaining battery life of only 30 seconds.
Only
two
people can go over the bridge at one time.
The
torch
needs to be returned to the remaining persons.
The
five
people take different times to cross the bridge.
One
takes 1
second to cross the bridge.
The
others
take 3 seconds, 6 seconds, 8 seconds and 12 seconds.
Everyone
crosses the bridge within 30 seconds.
Question
:
How do they proceed?
See
answer
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