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

