Latest self Aptitude Question SOLUTION: A bridge will collapse in 17 minutes. 4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them. Only two people can cross at

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(#M40001466) SELF question Keep an EYE

A bridge will collapse in 17 minutes.

4 people want to cross it before it will collapse. It is a dark night and there is only one torch between them.

Only two people can cross at a time.

"A" takes a minute to cross.
"B" takes 2 minutes.
"C" takes 5
and "D" takes 10 minutes

How do they all cross before the bridge collapses?

Karthick Babu (13 years ago)

Solved sanjeev Read Solution (5)

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Read Solution (5) :

sanjeev  (13 years ago)

A+B ....... 2 mins....A stays there.
B comes back ..2 min
C+D .. cross in 10 mins
A comes back in 1 min.
A+B crossin 2 mins.
Total time = 2+2+10+1+2=17 mins

Is this solution Helpfull? Yes (7) | No   

Bawa  (13 years ago)

A+B ....... 2 mins....A stays there.
B comes back ..2 min
C+D .. cross in 10 mins
A comes back in 1 min.
A+B crossin 2 mins.
Total time = 2+2+10+1+2=17 mins

Is this solution Helpfull? Yes (3) | No   

Nitin Awasthi  (13 years ago)

A and B cross the bridge first (2 min). B stays at the other end and A returns back (1 min). Now, C and D cross the bridge together (10 min) and B returns from the other end to the previous point (2 min). Finally, A and B cross the bridge (2 min). So, the total time taken is 2 min + 1 min + 10 min + 2 min + 2 min = 17 min.

Is this solution Helpfull? Yes (3) | No (1)  

TAPAS RANJAN PANI  (13 years ago)

1st A & B ll go other side,
A ll come back and (C & D)ll go other side
then B ll return to take A.
total time taken=2+1+10+2+2

Is this solution Helpfull? Yes (1) | No (2)  

TAPAS RANJAN PANI  (13 years ago)

1st A & B ll go other side,
A ll come back and (C & D)ll go other side
then B ll return to take A.
total time taken=2+1+10+2+2

Is this solution Helpfull? Yes (1) | No (1)  

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