Come out of the Well and think it is very easy

These are the instructions calculate who all should go along to save the time. If you are not able to do let me know I will tell you the answer ...........

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