There is a bridge with both sides secured with two gaurds. On the extreme right side of the bridge there are four people (Nancy, Charles, David, Rahul) who want's to cross the bridge from right to left, without getting caught by guards.
The guards will be available 24/7. Apart from 17minutes in the night, when the bridge will losse current. So! these four people has 17 minutes to cross the bridge. Help them cross the bridge.
points to be noted
1, Nancy takes 1 minutes to cross the bridge.
2, Charles takes 2 minutes to cross the bridge.
3, David takes 5 minutes to cross the bridge.
4, Rahul takes 10 minutes to cross the bridge.
5, The bridge can only handle two people at a time.
6, They only have one lamp( they can't travels without lamp)
This is how the bridge looks like with people.
Answers
Answer:
Nancy and charles will go to another side and then nancy will come back (time⌚taken=3min including the time needed for coming back)
Nancy and charles will go to another side and then nancy will come back (time⌚taken=3min including the time needed for coming back) Then,
Nancy and charles will go to another side and then nancy will come back (time⌚taken=3min including the time needed for coming back) Then, RAHUL and DAVID will go to another side and CHARLES will come back (time⌚taken=11 min)
Nancy and charles will go to another side and then nancy will come back (time⌚taken=3min including the time needed for coming back) Then, RAHUL and DAVID will go to another side and CHARLES will come back (time⌚taken=11 min) Finally,
Nancy and charles will go to another side and then nancy will come back (time⌚taken=3min including the time needed for coming back) Then, RAHUL and DAVID will go to another side and CHARLES will come back (time⌚taken=11 min) Finally, CHARLES and NANCY will go to another side (time taken=2min)
Step-by-step explanation:
Another point you haven't noted is that if two person are travelling on the boat then highest time taken by people will be taken
Ex if rahul (10) and david (5) travel together then time taken will be 10 minutes so coming to the point,
Firstly,
Nancy and charles will go to another side and then nancy will come back (time⌚taken=3min including the time needed for coming back)
Then,
RAHUL and DAVID will go to another side and CHARLES will come back (time⌚taken=11 min)
Finally,
CHARLES and NANCY will go to another side (time taken=2min)
Total time consumed =16minutes
Hence solved
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