Need help with riddle

[iNeb]

It is a dark and stormy night, and foggy, and rather cold. In the middle of nowhere a family battle the elements to get home, they have been walking for miles when they get to 'the great ravine'. For miles in either direction there is only one crossing a very small rickety rope bridge, the family must cross the bridge, your aim is to work out in what order they should cross to get across the bridge in the shortest possible time. Now here are the problems, firstly as the bridge is so old they can only risk two people crossing it at once, also stupidly they only have one torch. No more than two people may cross the bridge at one time and because it is so foggy and there are planks missing from the bridge one of them must be carrying the torch. The ravine is too wide to throw the torch across so someone is going to have a busy night going back and forth.

DATA : There are four members of the family, a boy who is quick who can cross the bridge in only one minute, his sister who is a little slower who takes two, his mother who is slower still at five minutes, and finally the grandmother who is getting on a bit and takes a whopping ten whole minutes to cross.

[JacobM5727]

so two people at a time, one new one each time
i think it doesnt matter what order they cross, since they all need to cross.. so:
boy grandma
boy mother
boy sister
or whatever order.. as long as the fast boy is there

[no1_vern]

Jacob your too too fast for me.

[iNeb]

It needs to be in an order though

[JacobM5727]

then use mine.. as 2+5+10+1+1+1+1+1 (or whatever) is the same any order

lol vern

it seems like somthing is missing.. like "the boy gets tired after so many trips", or something

[iNeb]

I don't get that order

[JacobM5727]

boy grandma 10m 1st trip
boy 1m returning with torch
boy mother 5m 2nd trip
boy 1m returning with torch
boy sister 2m 3rd trip

[OuTpaTienT]

Either you left something out, or this is a very lame riddle. In fact I wouldn't even call it a riddle, riddles are difficult to solve.

Using the boy as the one that returns with the torch because he's the fastest, then it doesn't matter what order you go in, it takes a total of 19 minutes.

Boy (with torch) and girl cross: 2 min
Boy comes back: 1 min
Boy and mother cross: 5 min
Boy comes back: 1 min
Boy and grandmother cross: 10 min

[iNeb]

Neither of you are right for the riddle

[JacobM5727]

tell us the right answer then