Solving the Bridge Crossing Puzzle: Teamwork and Logical Thinking

Hello friends,

I recently came across a puzzle that involves a family crossing a bridge at night carrying a lamp. Try as I might, I could not figure this out. Could anyone kindly help out with the solution?

Below is the puzzle:

>> It is night, so you must have a fire lamp.
>> Each person crosses the bridge at a different speed:
[1-sec] [3-sec] [6-sec] [8-sec] [12-sec]
>> Only 1 or 2 persons can pass the bridge at a time.
>> A pair must walk together at the rate of the slower person.
>> The fire lamp is enough for 30 seconds only!!!

I hope this helps clarify the puzzle. Let me know if you need more information or assistance.

Below is the puzzle...

>> It is night, so you must have a fire lamp.
>> Each person crosses the bridge at a different speed: [1-sec] [3-sec] [6-sec] [8-sec] [12-sec].
>> Only 1 or 2 persons can pass the bridge at a time.
>> A pair must walk together at the rate of the slower person.
>> The fire lamp is enough for 30 seconds only!!!

Try this:

A + B cross in 3 seconds (total time = 3 seconds)
A returns in 1 second (total time = 4 seconds)

D + E cross in 12 seconds (total time = 16 seconds)
B returns in 3 seconds (total time = 19 seconds)

A + C cross in 6 seconds (total time = 25 seconds)
A returns in 1 second (total time = 26 seconds)

A + B cross in 3 seconds (total time = 29 seconds)