**Brain Twister River Riddle - 31 July**

A bridge is about to collapse. There are four people P, Q, R and S on one of the side. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

**For Solution :**Click Here

P+Q cross (Running total = 2mins)

ReplyDeleteP returns (3)

R+S cross (13)

Q returns (15)

P+Q cross (17)

P+Q cross (Running total = 2mins)

ReplyDeleteP returns (3)

R+S cross (13)

Q returns (15)

P+Q cross (17)

P+Q cross (Running total = 2mins)

ReplyDeleteP returns (3)

R+S cross (13)

Q returns (15)

P+Q cross (17)

P carries R (1 min)

ReplyDeleteQ carries S (3 min)