[Sogelec]

Originally Posted by J()e

here is one not hard medium level riddle

we have a bridge...and 4 people wants to pass this bridge....

the 1st one needs 1 min
the 2nd one needs 2 mins
the 3rd one needs 5 mins
the 4th one needs 10 mins

haida wa2et only raw7a...

and they must go 2 people at the same time and one of the is obliged to get back ..

how can all of the 4 people cross the bridge in 17 mins ....

The Time when 1 of them return byen7asab mn l 17 minutes?